Top 10 Online Casino Slots

With so many online casinos on the Internet it can be difficult to search them all and find the right one that suits you the best. Therefore, to help you out, we have done our homework to bring you the top of the line online casinos where you can enjoy playing in high quality gambling environment.

• Since the best game developers are the brains behind our top free online slots, these games are guaranteed to give players the best gaming experience. Why Play Our Free Slot Machine Games? Playing free online slots at SlotoZilla is the best way to experience casino gaming. We sort slot games by theme, type, and features, so whether you are a.
• Top 10 Canadian Online Casinos: Playing in a reputable online play in Canada is very important, as you need to feel comfortable on gambling site that is safe and legal. The specific advantages of these websites are toll-free support numbers, huge welcome bonuses, quick payments and banking options convenient for this state.

The best casino bonus offer are not always the easiest to choose between but you can try a search using promotion codes casino, top online casino bonus, slots deposit bonus, casino best deposit bonus, casino coupon code or promotion codes casino to show a few examples.

Our best online casinos page is created to bring you the best information about some of the most reputable and trustworthy casinos on the net. We have ranked the casinos according to crucial criteria like license, payout percentages, reputation, games, bonuses, player support and banking. Our experts have done their best to ensure that your online casino experience stays positive.

• Learn where you can play high quality games and enjoy the best online casino bonuses.
• Find out more about the reputation, safely measures and banking options offered by the best online casinos.
• Enjoy high-end game play with some nice payouts.

TOP RATED AND RANKED ONLINE CASINO SITES 2021

HOW WE TEST AND RANK THE BEST CASINOS

Our team spent a lot of time testing and researching every casino in order to come up with the 10 best online casinos in existence today. We make sure ALL important factors for online casinos have been fully assessed before concluding our final list of the absolute best online casino operators. If casinos are not good enough, we simply won't list them here. It's that simple! More detailed info here.

• WELCOME BONUSESWe make sure you will get the best welcome bonuses to give your bankroll a nice boost.
• DEPOSIT OPTIONSWe know it's vital to players to have a full variety of options for both deposit and withdrawals.
• GAME SELECTIONIt's important that every casino offers a good selection and variety of games.

• CASH OUTSWe test the cash-out procedures so there are no issues withdrawing your money.
• 24/7 CUSTOMER SUPPORTEvery casino must have around the clock customer service available.
• SECURITYPersonal data must be kept safe and all financial transactions 100% secure.

#1 BONUS

100% up to $5000

• 97% Payout
• 1-12 days Cashout
• 80+ Games
VISIT CASINO

#1 SLOTS

100% up to $200

• 97.7% Payout
• Within 24 hrs Cashout
• 179 Games
VISIT CASINO

#1 BLACKJACK

100% up to £1,200

• 98% Payout
• Within 24 hrs Cashout
• 500+ Games
VISIT CASINO

#1 VIP

100% up to £200

• 96.7% Payout
• Within 24 hrs Cashout
• 3700+ Games
VISIT CASINO

POPULAR CASINO GAMES

At CasinoDirectory.com we have tested and written compelling reviews of the best selection of casino games. Feel free to try out all the games. Many games offer Free Play mode and some even Free Spins or Bonuses.

BEST SOFTWARE PROVIDERS FOR ONLINE CASINOS

HOW THE BEST ONLINE CASINO SITE IS PICKED

In order to choose the best online casino for your taste and money, we suggest using the following bullet point list about the most important factors to have in mind when choosing the best online casino site. Some of them will be discussed in detail below.

- Casino License, Reputation, Security, Trustworthiness and Payout Percentage
- Online Casino Software, Games Selection, Graphics and Audio and General Usability
- Player Support Service, Live Chat Feature and 24/7 Availability
- Bonus Offers, Promotions, VIP and Loyalty Program and so on
- Deposit and Withdrawal Methods and Currencies
- Withdrawals Turnaround Times, Reversal Period and Weekend Payouts

License and Reputation

First and foremost, always check the reputation of online casinos. It is always advisable to read online casino reviews as well as player testimonials about their personal gaming experience with a casino. That way you will get a complete picture about specific casino. In addition, always check whether the casino is legally allowed to practice online gambling. You can do this by looking for seals of approval by well-known gambling jurisdictions like Gibraltar and Malta on the casino homepage. You should also look for seals from auditing firms like eCORGA or TST that are responsible for the fair play and randomness of the casino games.

Games and Bonuses

Good online casinos usually offer wide selection of top notch virtual games that can be played instantly or via the download client. The games are subdivided into categories like slots, video poker, table games, roulette, blackjack, progressive games and so on. Choose a casino that offers diverse games in abundance or a casino that has the games you want to play. Also make sure that the games are created by well-known software provider so that they have good quality and graphics.

Next to the games, the bonuses should also be considered. Some online casinos offer a great deal of diverse bonus offers for new players. But quantity is not always equal with quality. So it is advisable to read the bonus terms and conditions before redeeming it. Factors that make up a generous bonus include lower wagering requirements, good selection of games that can be played with it etc.

Customer Support and Banking

Online casinos must have quality customer support service. After all you play online so if any problems arise you need to contact responsive and helpful player support representatives. The most common ways to contact them include e-mail, call back support, international phone number and live chat.

Banking is also very important. You play with real money so you definitely need reliable and safe deposit and withdrawal methods that you can use to add money to and cash out winnings from online casinos. Therefore, choose an online casino that offers some of the following good banking options: Visa, Maestro, Ukash, PayPal, Neteller, Skrill, direct bank transfer etc. Also make sure that the casino processes withdrawals faster and that has high deposit and cash out limits.

READY TO PLAY NOW? CHECK OUT OUR #1 CASINO

Spartan Slots

CASINODIRECTORY.COM SUPPORTS MOBILE!

CHECK OUT OUR SITE ON YOUR SMARTPHONE OR TABLET.

Top 10 Online Casino Slots to Play in 2021

Slot games are probably the most popular types of casino games in the world. In fact, they're probably the first things that come to mind when you think of casino games. Poker, Roulette, and Blackjack are up there in the list as well, but slots will always be an important part of casinos and the most loved type of game to play by many users around the world.

As such, with the appearance and sudden rise in popularity of the online gambling scene, slots also take a crucial role in internet gambling. Online casinos have adopted the traditional slot machines and incorporated them into their services, with some online enterprises offering hundreds of online slots for all users to enjoy. Happy birthday casino bonus free.

How do these online slots work and what makes them so popular? In this article, we'll be breaking down everything you need to know about online slots and answer some questions that you may have, like what are casino slots and how do paylines work. Most importantly, we'll tell you all about the best online slots to play in 2021!

1. Gonzo's Quest

Gonzo's Quest puts side by side with Gonzo, an adventurer who has set out to find the lost city of El Dorado. Alongside him, you'll be hunting the treasures that are said to be lying in this rich city. The theme of the game evokes the ancient air of colonial America, and you'll be reminiscing the good old days of hearing this story back when you were just a kid.

There's some peculiar appeal to this game, as the slots aren't really reels per se. You get presented with a bunch of Aztec-looking stones, with each of them having specific symbols (representing different prices, of course).

Gonzo's Quest is a 5-reel video slot game that has awesome graphics and a super fun interface, which makes it one of the most popular slots to play in 2021 according to many experienced users. You can expect this game to have an RTP of 96% in most online casinos, which puts it just on the average of the industry and makes this game as profitable as the majority of NetEnt slots.

Don't go to play it just yet, though! There's also a new game that has released, called Gonzo's Quest Megaways, which combines the magic of the traditional Gonzo's Quest game with the features of Megaways thanks to Red Tiger Gaming's licensing and the fact that the company was purchased by NetEnt.

You can find Gonzo's Quest, as well as the Gonzo's Quest Megaways slot, at the best NetEnt casinos in the world. It's up to you to decide which online casino to visit and enjoy the best casino bonuses to play Gonzo's Quest for free! Free spins await players living anywhere in the world.

Special Bonuses

Gonzo's Quest aims to bring you straight to the search for El Dorado, which is said to be filled with treasure and riches. To honor this, the game has a lot of bonuses for you to earn as you play. There's a special free fall bonus, which increases your earnings and chances to get more winnings in a single spin. You could even get a progressive multiplier, depending on what you get!

The Gonzo's Quest Megaways slot is also available in some of the world's best online casinos, where you'll be able to play it and get nothing but the finest of casino rewards on the internet.

2. Starburst

There's a reason why Starburst is such a popular online casino game. The slots offer you the chance to earn an amount of over €50,000, and there are a ton of free spins that you could win if you manage to earn the wild symbols that appear on the three middle reels of the game. It's a very entertaining game that thousands of users enjoy on a daily basis.

When you get one of the bonus stars that show up on the main columns, you get a free spin that could net you combos worth hundreds of euros at once.

The theme of the game itself looks very peculiar and differs from most of what you see in online casino slots. The game reminisces of the old arcade games that you probably played as a kid. The theme brings you back to the old videogames of the early ‘90s where jewels seemed to be everywhere, but the graphics seem updated to fit the modern industry standards.

If you like to play slot games with a soundtrack, this is probably the best one for you. The game has very cool sounds that almost any player should enjoy. The game is also playable without the sounds, but it feels like the whole atmosphere is lost if you choose to silence it.

With an RTP of 96.1%, this basic casino game is extremely easy to understand and even easier for you to win rewards while playing it. It has to be said, though, that Starburst's simplistic system of just 10 paylines might not be the most entertaining for veteran players. However, we do know of many veterans who still play Starburst consistently.

This online slot has rewarded people from all over the world, and you could be one of the lucky ones to earn a large sum of cash while spinning the Starburst reels.

Released in 2012, Starburst is an extremely popular online casino slot that has remained relevant for almost a decade. You can expect this game to stay at the top of the online casino slot industry for years to come!

Awesome Rewards

We've seen players who have earned over 200 times what they originally bet on many occasions thanks to the progressive active rewards of Starburst. As such, you can easily multiply your earnings if you manage to land the Starburst Wilds, which expands the reels and gives you a free spin.

The best thing about the game is that if you manage to land three wilds in a row, you'll be entering the chance to get more than €50,000 in your third free spin. What's not to love about this classic of the online casino industry?

3. Holmes and the Stolen Stones

Holmes and the Stolen Stones has quickly become the most popular game from developer Yggdrasil. The game has a total of 5 progressive jackpots (which means you could earn a metric ton of cash if you're lucky enough). This fantastic title comes with an RTP of 96.8%, making its lucrative potential even bigger than the one you get with Starburst and even Gonzo's Quest.

Yggdrasil has some hidden gems out there, and Holmes Quest stands as one of the best games to play in 2021 if you're looking to try your luck and earn a large sum of cash while playing slots.

The theme of the game is exactly what its name suggests: a classic Sherlock Holmes search for the stolen stones. These stones actually appear in-game, and they represent the jackpots that you could earn should you be lucky enough to find them.

The developer of this game has been widely regarded as one of the best online casino game developers when it comes to the visual appeal of their games, and the drawings, symbols, and overall theme of Holmes and the Stolen Stones makes this game one of the best that we've tried so far.

There are some cool keyhole symbols spread through the reels, which will net you 10,000 coins if you manage to get 5 of them in one of your paylines (that's a ton of money, regardless of your coin value!).

Finding the Stolen Stones

If you manage to earn the bonuses, you'll be taken to a special screen that has a lot of boxes scattered throughout it. You can't see what's inside the boxes until you open them, though! If you're lucky enough, you'll be able to collect the shards of the Stolen Stones. The stones will eventually allow you to trigger a massive bonus and earn one of the game's jackpots.

You could also get other cool prizes in the boxes, such as additional money to add to your wallet. The game surely rewards constant players and encourages you to stay loyal to Holmes' search, as his success will also mean a bigger reward for yourself!

You can find this fantastic casino game at the best Yggdrasil casinos in the world. This game is just one of the many fantastic and lucrative titles that Yggdrasil has produced!

4. Astro Babes

We fully recommend this game for people who love space-themed things as well as slot machines. You can play this online casino game in any of your mobile devices, thanks to the full compatibility made by developer Playtech (which means that you can play this title at the best Playtech casinos in the world).

Every bonus, reel line, and symbol are directly related to space, and most importantly, it's a representation of most sci-fi things that you've seen in movies or series before.

This fantastic game has one simple problem: it has a relatively small RTP of just 95.06%, which puts it below the average for a popular online slot. The world's best online slots have an RTP of 96% or higher, which gives players a fair chance to beat the odds and walk away with a profit.

Even though the low RTP can make the game a bit inconvenient for some people, you can rest assured that hundreds of players have still walked away with a profit after playing Astro Babes. Besides, even if you lose, the game's graphics will keep you on a good mood and ready for your next big win.

Astro Babes offers you the chance to earn 5,000 times the amount of money that you bet, even on free spins, if you're lucky enough to get the best out of the jackpot. It's a versatile game, which shares the visual appeal of some of the online industry's finest titles.

This game has a unique design feature that it's widely regarded as uncommon in the slot industry. The art that you see in the reels is incredibly unique. Large images make up for most of the space in the reels, meaning that the Astro Babes that you see when spinning the wheel are actually part of various lines at once.

The design of the game makes you want to keep earning those bonuses, as it has over 100 paylines for you to choose from. If you're confident, you could place a bet of up to €500 per roll – but be ready! You might end up winning a ton of money if the Astro Babes show up in the correct order!

Wild Reels

The wild symbols are one of the game's biggest features. If you manage to land 5 wild reels during one spin, you'll be making 5,000 times the amount of money that you originally bet. That could mean a disgustingly large amount of money for you in a single roll! You'd need to be incredibly lucky, of course, but if you're feeling it, give Astro Babes a chance.

5. Golden Legend

Golden Legend is a Chinese-themed game, which looks to evoke the golden days of the glorious Chinese era by offering players the chance to win a ton of money in rewards. Unlike other games, Golden Legends isn't about the amount of wild symbols that you get on the screen at the same time. The game packs an RTP of 96.80%, one of the biggest RTP percentages on this list and one of the best that you'll find at any of the world's best online casino slots.

Instead, Golden Legends offers the chance for players to earn up to 20 free spins in a single play, allowing you to collect a tremendous amount of money without spending an extra dime on additional spins. Even so, there are wild symbols scattered through the reels which will help you make additional money.

Although the game itself looks very simplistic in terms of the features that it offers, it's super fun to play and you will not struggle to grasp the basic concepts out of it anytime soon. In fact, you'll be able to get the best out of this game even if you haven't played slots games before. However, this is a 5-reel slot game, so you'd be better off learning the basics before getting started.

You have plenty of chances to win big, with some users having won up to 10,000 times their original wager in a single spin. As with most of the other games, you need to be quite lucky to get it, but it's not as uncommon as it is in other popular slots.

Winning Big in Golden Legend

What makes Golden Legend so good is that most of its bonuses can be stacked over and over, which means that a chain of lucky wins will net you a large amount of cash. Look out for the Golden Dragon symbol as you play, as well as for the coins mimicking the currency used in the China of yore – this will give you the largest bonuses available on the game!

You can check out the best Play N' Go Casinos in the world if you'd like to play Golden Legend right now, or you can head straight to our recommended casino by clicking the button below. What you do is up to you!

Top 10 Online Casino Slots

6. Guns N' Roses Slots

NetEnt is regarded by many players as the best online casino game developer, and their reputation has only grown since the release of the Guns N Roses slot game. If you're a fan of rock music, this slot game is probably the best one for you. The theme of the game is great and beautifully designed, all themed in honor of one of the greatest rock bands of all time.

Thus, the Guns N Roses slots have become incredibly popular thanks to its availability to be played from the comfort of your own home. There are many bonuses that you can find on the game, which are easily obtainable by playing even simple one-liners, but the biggest appeal of the game is both the music and the art – the theme both features create is simply incredible.

This game is not all about music and one of the best rock bands in history, though. The Guns N' Roses slot brings a 96.98% RTP percentage to the table, which means that the house edge is just over 3% in this fantastic game. No wonder why so many people walk away with a profit after playing it!

Netting any winning payline means that the crowd on the background goes wild for your profits, and you can see everyone cheering whenever you manage to win some coins. The symbols on the board are fully interactive and the transitions between the regular symbols and the ones you get when you win are nothing short of incredible.

You can even choose which Guns N' Roses songs you want to listen while playing, as the game comes with an integrated playlist that you can access at any given time.

Random Wild

Get ready to cheer for the Guns N' Roses symbol, as whenever it pops up (an occurrence that happens at random) you'll be getting a full reel of wild symbols to expand your winnings as much as possible.

The amount of random, profitable events that you get in this slot game is almost as great as the legendary rock band, but the best thing you'll get from this popular spinning game is the quality rock music and the well-presented theme.

7. Wild North

Wild North is a nature-themed game which can be accessed from almost every type of device. Smartphones, computers, tablets, and every type of popular device can be used to play this cool-looking slot game. It doesn't offer as many paylines as other games, with just 40 in total, but they're easier to win than in other games we've reviewed in this list.

There are a ton of bonus features that come in Wild North, too. This is probably the main selling point of the game – you can rest assured that almost every play will give you the chance to experience a bonus event, and hopefully you'll be able to profit from it.

You'll access the bonus features of the game as soon as you land the Northern Lights symbol three times in one spin. Then, you'll be shown a special screen containing 7 bonuses – one of them will be selected at random, and you'll be able to benefit from it.

The game packs a 96.65% RTP, making it easy for players to make a profit in this medium volatility online slot. The game is extremely fun and easy to get into, as well as profitable and well-designed.

The Awesome Bonus Features of Wild North

What makes Wild North different from other games, you may wonder? Simply the amount of awesome features that it offers. The bonuses are almost countless, and you can even multiply your earnings by 2500 times the amount of your original bet. This is all tied to your luck, of course, but the game is easy to play and the rewards are easy to earn – every spin is a big opportunity in Wild North.

Most of the bonus features come in the form of wild animals that you'd see in most northern settings, and they become free spins that you can use to turn into free money. See if the North is on your side by logging into any of your devices and start playing right now!

8. Jewel Box

Jewel Box is one of the best online casino slots you can play in 2021 if you're planning to do it from a computer. The game is also compatible with mobile devices, but we've seen that it just lacks most of the appeal that is present in the computer version. With that said, the graphics of the game are astonishing, and the sounds make it more immersive than most other online slot games.

Jewel Box offers players the chance to win with stacked lines, which means you don't need to have one of your paylines starting on the first reel. Instead, you can win rewards based on the number of jewels that get stacked together. It's a cool function, which also makes the game easier to understand in the eyes of those with little experience in slot games.

The game packs a solid 95.79% RTP, which keeps it up there with some of the best online slots on the internet in terms of return rates.

Always look for the emeralds and diamonds in the game! These are often associated with the best rewards you can get. Although you can earn more money with these two types of jewels, your chances of growing your wallet with smaller wins are also gigantic.

Simple Rewards, Awesome Wins

The rewards on this game are very simple to understand, easy to get, and won't give you much of a problem when selecting them. You get presented with three options, each offering a different reward – this will remain hidden until you complete the small game, allowing you to boost your rewards and earn a good amount of money while doing so.

To be completely honest, Jewel Box isn't the most complex game, nor does it come with a ton of extra content. Regardless, it offers users the chance to win big with small bets and a little luck!

9. Vikings Go Wild

Follow the Vikings' epic adventure to fight a monster in this Nordic-themed game, brought to you by the popular publisher Yggdrasil. You can bet any sum of money that you like, ranging from less than €1 per spin up to €50.

We know how good music could make or break a game, and Vikings Go Wild gives you an epic feeling of immersion that not many other games are able to offer. With that said, the art is relatively silly and cartoonish, but seeing as it's very well drawn, many users have grown to love it.

You can't make a ton of money on a single line, as you could do in other games. However, you can indeed earn a ton of cash by winning multiple small bets in a row, something that this game seems to allow constantly.

Even better – Vikings Go Wild has a sticky wild option, where you can keep watching the reels spin and spin as long as you keep getting the same figures repeatedly. The game's above average RTP of 96.03% keeps it appealing to all players and as entertaining as these games come.

Constant Free Spins and Bonus Features

Netting big wins and paylines in this game means that you'll be constantly fed with more free spins. As we said, wins might not be as big as they are in other games such as Holmes and the Stolen Stones, but the amount of free spins does make up for this fact. The game constantly varies in shape, making it very hard to get bored of playing it.

If you love Vikings and feeling part of something greater than yourself, this game is probably for you.

10. Jack Hammer

Are you a fan of comic books? This astonishing 5-reel, 25 payline game is all about the old artistic style used to create the comic books of yore. Follow Jack Hammer's mission to stop the evil doctor from destroying the city, saving citizens from danger and earning you some amazing bonus wins that you'll surely love.

With so many online casinos on the Internet it can be difficult to search them all and find the right one that suits you the best. Therefore, to help you out, we have done our homework to bring you the top of the line online casinos where you can enjoy playing in high quality gambling environment.

• Since the best game developers are the brains behind our top free online slots, these games are guaranteed to give players the best gaming experience. Why Play Our Free Slot Machine Games? Playing free online slots at SlotoZilla is the best way to experience casino gaming. We sort slot games by theme, type, and features, so whether you are a.
• Top 10 Canadian Online Casinos: Playing in a reputable online play in Canada is very important, as you need to feel comfortable on gambling site that is safe and legal. The specific advantages of these websites are toll-free support numbers, huge welcome bonuses, quick payments and banking options convenient for this state.

The best casino bonus offer are not always the easiest to choose between but you can try a search using promotion codes casino, top online casino bonus, slots deposit bonus, casino best deposit bonus, casino coupon code or promotion codes casino to show a few examples.

Our best online casinos page is created to bring you the best information about some of the most reputable and trustworthy casinos on the net. We have ranked the casinos according to crucial criteria like license, payout percentages, reputation, games, bonuses, player support and banking. Our experts have done their best to ensure that your online casino experience stays positive.

• Learn where you can play high quality games and enjoy the best online casino bonuses.
• Find out more about the reputation, safely measures and banking options offered by the best online casinos.
• Enjoy high-end game play with some nice payouts.

TOP RATED AND RANKED ONLINE CASINO SITES 2021

HOW WE TEST AND RANK THE BEST CASINOS

Our team spent a lot of time testing and researching every casino in order to come up with the 10 best online casinos in existence today. We make sure ALL important factors for online casinos have been fully assessed before concluding our final list of the absolute best online casino operators. If casinos are not good enough, we simply won't list them here. It's that simple! More detailed info here.

• WELCOME BONUSESWe make sure you will get the best welcome bonuses to give your bankroll a nice boost.
• DEPOSIT OPTIONSWe know it's vital to players to have a full variety of options for both deposit and withdrawals.
• GAME SELECTIONIt's important that every casino offers a good selection and variety of games.

• CASH OUTSWe test the cash-out procedures so there are no issues withdrawing your money.
• 24/7 CUSTOMER SUPPORTEvery casino must have around the clock customer service available.
• SECURITYPersonal data must be kept safe and all financial transactions 100% secure.

#1 BONUS

100% up to $5000

• 97% Payout
• 1-12 days Cashout
• 80+ Games
VISIT CASINO

#1 SLOTS

100% up to $200

• 97.7% Payout
• Within 24 hrs Cashout
• 179 Games
VISIT CASINO

#1 BLACKJACK

100% up to £1,200

• 98% Payout
• Within 24 hrs Cashout
• 500+ Games
VISIT CASINO

#1 VIP

100% up to £200

• 96.7% Payout
• Within 24 hrs Cashout
• 3700+ Games
VISIT CASINO

POPULAR CASINO GAMES

At CasinoDirectory.com we have tested and written compelling reviews of the best selection of casino games. Feel free to try out all the games. Many games offer Free Play mode and some even Free Spins or Bonuses.

BEST SOFTWARE PROVIDERS FOR ONLINE CASINOS

HOW THE BEST ONLINE CASINO SITE IS PICKED

In order to choose the best online casino for your taste and money, we suggest using the following bullet point list about the most important factors to have in mind when choosing the best online casino site. Some of them will be discussed in detail below.

- Casino License, Reputation, Security, Trustworthiness and Payout Percentage
- Online Casino Software, Games Selection, Graphics and Audio and General Usability
- Player Support Service, Live Chat Feature and 24/7 Availability
- Bonus Offers, Promotions, VIP and Loyalty Program and so on
- Deposit and Withdrawal Methods and Currencies
- Withdrawals Turnaround Times, Reversal Period and Weekend Payouts

License and Reputation

First and foremost, always check the reputation of online casinos. It is always advisable to read online casino reviews as well as player testimonials about their personal gaming experience with a casino. That way you will get a complete picture about specific casino. In addition, always check whether the casino is legally allowed to practice online gambling. You can do this by looking for seals of approval by well-known gambling jurisdictions like Gibraltar and Malta on the casino homepage. You should also look for seals from auditing firms like eCORGA or TST that are responsible for the fair play and randomness of the casino games.

Games and Bonuses

Good online casinos usually offer wide selection of top notch virtual games that can be played instantly or via the download client. The games are subdivided into categories like slots, video poker, table games, roulette, blackjack, progressive games and so on. Choose a casino that offers diverse games in abundance or a casino that has the games you want to play. Also make sure that the games are created by well-known software provider so that they have good quality and graphics.

Next to the games, the bonuses should also be considered. Some online casinos offer a great deal of diverse bonus offers for new players. But quantity is not always equal with quality. So it is advisable to read the bonus terms and conditions before redeeming it. Factors that make up a generous bonus include lower wagering requirements, good selection of games that can be played with it etc.

Customer Support and Banking

Online casinos must have quality customer support service. After all you play online so if any problems arise you need to contact responsive and helpful player support representatives. The most common ways to contact them include e-mail, call back support, international phone number and live chat.

Banking is also very important. You play with real money so you definitely need reliable and safe deposit and withdrawal methods that you can use to add money to and cash out winnings from online casinos. Therefore, choose an online casino that offers some of the following good banking options: Visa, Maestro, Ukash, PayPal, Neteller, Skrill, direct bank transfer etc. Also make sure that the casino processes withdrawals faster and that has high deposit and cash out limits.

READY TO PLAY NOW? CHECK OUT OUR #1 CASINO

Spartan Slots

CASINODIRECTORY.COM SUPPORTS MOBILE!

CHECK OUT OUR SITE ON YOUR SMARTPHONE OR TABLET.

Top 10 Online Casino Slots to Play in 2021

Slot games are probably the most popular types of casino games in the world. In fact, they're probably the first things that come to mind when you think of casino games. Poker, Roulette, and Blackjack are up there in the list as well, but slots will always be an important part of casinos and the most loved type of game to play by many users around the world.

As such, with the appearance and sudden rise in popularity of the online gambling scene, slots also take a crucial role in internet gambling. Online casinos have adopted the traditional slot machines and incorporated them into their services, with some online enterprises offering hundreds of online slots for all users to enjoy. Happy birthday casino bonus free.

How do these online slots work and what makes them so popular? In this article, we'll be breaking down everything you need to know about online slots and answer some questions that you may have, like what are casino slots and how do paylines work. Most importantly, we'll tell you all about the best online slots to play in 2021!

1. Gonzo's Quest

Gonzo's Quest puts side by side with Gonzo, an adventurer who has set out to find the lost city of El Dorado. Alongside him, you'll be hunting the treasures that are said to be lying in this rich city. The theme of the game evokes the ancient air of colonial America, and you'll be reminiscing the good old days of hearing this story back when you were just a kid.

There's some peculiar appeal to this game, as the slots aren't really reels per se. You get presented with a bunch of Aztec-looking stones, with each of them having specific symbols (representing different prices, of course).

Gonzo's Quest is a 5-reel video slot game that has awesome graphics and a super fun interface, which makes it one of the most popular slots to play in 2021 according to many experienced users. You can expect this game to have an RTP of 96% in most online casinos, which puts it just on the average of the industry and makes this game as profitable as the majority of NetEnt slots.

Don't go to play it just yet, though! There's also a new game that has released, called Gonzo's Quest Megaways, which combines the magic of the traditional Gonzo's Quest game with the features of Megaways thanks to Red Tiger Gaming's licensing and the fact that the company was purchased by NetEnt.

You can find Gonzo's Quest, as well as the Gonzo's Quest Megaways slot, at the best NetEnt casinos in the world. It's up to you to decide which online casino to visit and enjoy the best casino bonuses to play Gonzo's Quest for free! Free spins await players living anywhere in the world.

Special Bonuses

Gonzo's Quest aims to bring you straight to the search for El Dorado, which is said to be filled with treasure and riches. To honor this, the game has a lot of bonuses for you to earn as you play. There's a special free fall bonus, which increases your earnings and chances to get more winnings in a single spin. You could even get a progressive multiplier, depending on what you get!

The Gonzo's Quest Megaways slot is also available in some of the world's best online casinos, where you'll be able to play it and get nothing but the finest of casino rewards on the internet.

2. Starburst

There's a reason why Starburst is such a popular online casino game. The slots offer you the chance to earn an amount of over €50,000, and there are a ton of free spins that you could win if you manage to earn the wild symbols that appear on the three middle reels of the game. It's a very entertaining game that thousands of users enjoy on a daily basis.

When you get one of the bonus stars that show up on the main columns, you get a free spin that could net you combos worth hundreds of euros at once.

The theme of the game itself looks very peculiar and differs from most of what you see in online casino slots. The game reminisces of the old arcade games that you probably played as a kid. The theme brings you back to the old videogames of the early ‘90s where jewels seemed to be everywhere, but the graphics seem updated to fit the modern industry standards.

If you like to play slot games with a soundtrack, this is probably the best one for you. The game has very cool sounds that almost any player should enjoy. The game is also playable without the sounds, but it feels like the whole atmosphere is lost if you choose to silence it.

With an RTP of 96.1%, this basic casino game is extremely easy to understand and even easier for you to win rewards while playing it. It has to be said, though, that Starburst's simplistic system of just 10 paylines might not be the most entertaining for veteran players. However, we do know of many veterans who still play Starburst consistently.

This online slot has rewarded people from all over the world, and you could be one of the lucky ones to earn a large sum of cash while spinning the Starburst reels.

Released in 2012, Starburst is an extremely popular online casino slot that has remained relevant for almost a decade. You can expect this game to stay at the top of the online casino slot industry for years to come!

Awesome Rewards

We've seen players who have earned over 200 times what they originally bet on many occasions thanks to the progressive active rewards of Starburst. As such, you can easily multiply your earnings if you manage to land the Starburst Wilds, which expands the reels and gives you a free spin.

The best thing about the game is that if you manage to land three wilds in a row, you'll be entering the chance to get more than €50,000 in your third free spin. What's not to love about this classic of the online casino industry?

3. Holmes and the Stolen Stones

Holmes and the Stolen Stones has quickly become the most popular game from developer Yggdrasil. The game has a total of 5 progressive jackpots (which means you could earn a metric ton of cash if you're lucky enough). This fantastic title comes with an RTP of 96.8%, making its lucrative potential even bigger than the one you get with Starburst and even Gonzo's Quest.

Yggdrasil has some hidden gems out there, and Holmes Quest stands as one of the best games to play in 2021 if you're looking to try your luck and earn a large sum of cash while playing slots.

The theme of the game is exactly what its name suggests: a classic Sherlock Holmes search for the stolen stones. These stones actually appear in-game, and they represent the jackpots that you could earn should you be lucky enough to find them.

The developer of this game has been widely regarded as one of the best online casino game developers when it comes to the visual appeal of their games, and the drawings, symbols, and overall theme of Holmes and the Stolen Stones makes this game one of the best that we've tried so far.

There are some cool keyhole symbols spread through the reels, which will net you 10,000 coins if you manage to get 5 of them in one of your paylines (that's a ton of money, regardless of your coin value!).

Finding the Stolen Stones

If you manage to earn the bonuses, you'll be taken to a special screen that has a lot of boxes scattered throughout it. You can't see what's inside the boxes until you open them, though! If you're lucky enough, you'll be able to collect the shards of the Stolen Stones. The stones will eventually allow you to trigger a massive bonus and earn one of the game's jackpots.

You could also get other cool prizes in the boxes, such as additional money to add to your wallet. The game surely rewards constant players and encourages you to stay loyal to Holmes' search, as his success will also mean a bigger reward for yourself!

You can find this fantastic casino game at the best Yggdrasil casinos in the world. This game is just one of the many fantastic and lucrative titles that Yggdrasil has produced!

4. Astro Babes

We fully recommend this game for people who love space-themed things as well as slot machines. You can play this online casino game in any of your mobile devices, thanks to the full compatibility made by developer Playtech (which means that you can play this title at the best Playtech casinos in the world).

Every bonus, reel line, and symbol are directly related to space, and most importantly, it's a representation of most sci-fi things that you've seen in movies or series before.

This fantastic game has one simple problem: it has a relatively small RTP of just 95.06%, which puts it below the average for a popular online slot. The world's best online slots have an RTP of 96% or higher, which gives players a fair chance to beat the odds and walk away with a profit.

Even though the low RTP can make the game a bit inconvenient for some people, you can rest assured that hundreds of players have still walked away with a profit after playing Astro Babes. Besides, even if you lose, the game's graphics will keep you on a good mood and ready for your next big win.

Astro Babes offers you the chance to earn 5,000 times the amount of money that you bet, even on free spins, if you're lucky enough to get the best out of the jackpot. It's a versatile game, which shares the visual appeal of some of the online industry's finest titles.

This game has a unique design feature that it's widely regarded as uncommon in the slot industry. The art that you see in the reels is incredibly unique. Large images make up for most of the space in the reels, meaning that the Astro Babes that you see when spinning the wheel are actually part of various lines at once.

The design of the game makes you want to keep earning those bonuses, as it has over 100 paylines for you to choose from. If you're confident, you could place a bet of up to €500 per roll – but be ready! You might end up winning a ton of money if the Astro Babes show up in the correct order!

Wild Reels

The wild symbols are one of the game's biggest features. If you manage to land 5 wild reels during one spin, you'll be making 5,000 times the amount of money that you originally bet. That could mean a disgustingly large amount of money for you in a single roll! You'd need to be incredibly lucky, of course, but if you're feeling it, give Astro Babes a chance.

5. Golden Legend

Golden Legend is a Chinese-themed game, which looks to evoke the golden days of the glorious Chinese era by offering players the chance to win a ton of money in rewards. Unlike other games, Golden Legends isn't about the amount of wild symbols that you get on the screen at the same time. The game packs an RTP of 96.80%, one of the biggest RTP percentages on this list and one of the best that you'll find at any of the world's best online casino slots.

Instead, Golden Legends offers the chance for players to earn up to 20 free spins in a single play, allowing you to collect a tremendous amount of money without spending an extra dime on additional spins. Even so, there are wild symbols scattered through the reels which will help you make additional money.

Although the game itself looks very simplistic in terms of the features that it offers, it's super fun to play and you will not struggle to grasp the basic concepts out of it anytime soon. In fact, you'll be able to get the best out of this game even if you haven't played slots games before. However, this is a 5-reel slot game, so you'd be better off learning the basics before getting started.

You have plenty of chances to win big, with some users having won up to 10,000 times their original wager in a single spin. As with most of the other games, you need to be quite lucky to get it, but it's not as uncommon as it is in other popular slots.

Winning Big in Golden Legend

What makes Golden Legend so good is that most of its bonuses can be stacked over and over, which means that a chain of lucky wins will net you a large amount of cash. Look out for the Golden Dragon symbol as you play, as well as for the coins mimicking the currency used in the China of yore – this will give you the largest bonuses available on the game!

You can check out the best Play N' Go Casinos in the world if you'd like to play Golden Legend right now, or you can head straight to our recommended casino by clicking the button below. What you do is up to you!

Top 10 Online Casino Slots

6. Guns N' Roses Slots

NetEnt is regarded by many players as the best online casino game developer, and their reputation has only grown since the release of the Guns N Roses slot game. If you're a fan of rock music, this slot game is probably the best one for you. The theme of the game is great and beautifully designed, all themed in honor of one of the greatest rock bands of all time.

Thus, the Guns N Roses slots have become incredibly popular thanks to its availability to be played from the comfort of your own home. There are many bonuses that you can find on the game, which are easily obtainable by playing even simple one-liners, but the biggest appeal of the game is both the music and the art – the theme both features create is simply incredible.

This game is not all about music and one of the best rock bands in history, though. The Guns N' Roses slot brings a 96.98% RTP percentage to the table, which means that the house edge is just over 3% in this fantastic game. No wonder why so many people walk away with a profit after playing it!

Netting any winning payline means that the crowd on the background goes wild for your profits, and you can see everyone cheering whenever you manage to win some coins. The symbols on the board are fully interactive and the transitions between the regular symbols and the ones you get when you win are nothing short of incredible.

You can even choose which Guns N' Roses songs you want to listen while playing, as the game comes with an integrated playlist that you can access at any given time.

Random Wild

Get ready to cheer for the Guns N' Roses symbol, as whenever it pops up (an occurrence that happens at random) you'll be getting a full reel of wild symbols to expand your winnings as much as possible.

The amount of random, profitable events that you get in this slot game is almost as great as the legendary rock band, but the best thing you'll get from this popular spinning game is the quality rock music and the well-presented theme.

7. Wild North

Wild North is a nature-themed game which can be accessed from almost every type of device. Smartphones, computers, tablets, and every type of popular device can be used to play this cool-looking slot game. It doesn't offer as many paylines as other games, with just 40 in total, but they're easier to win than in other games we've reviewed in this list.

There are a ton of bonus features that come in Wild North, too. This is probably the main selling point of the game – you can rest assured that almost every play will give you the chance to experience a bonus event, and hopefully you'll be able to profit from it.

You'll access the bonus features of the game as soon as you land the Northern Lights symbol three times in one spin. Then, you'll be shown a special screen containing 7 bonuses – one of them will be selected at random, and you'll be able to benefit from it.

The game packs a 96.65% RTP, making it easy for players to make a profit in this medium volatility online slot. The game is extremely fun and easy to get into, as well as profitable and well-designed.

The Awesome Bonus Features of Wild North

What makes Wild North different from other games, you may wonder? Simply the amount of awesome features that it offers. The bonuses are almost countless, and you can even multiply your earnings by 2500 times the amount of your original bet. This is all tied to your luck, of course, but the game is easy to play and the rewards are easy to earn – every spin is a big opportunity in Wild North.

Most of the bonus features come in the form of wild animals that you'd see in most northern settings, and they become free spins that you can use to turn into free money. See if the North is on your side by logging into any of your devices and start playing right now!

8. Jewel Box

Jewel Box is one of the best online casino slots you can play in 2021 if you're planning to do it from a computer. The game is also compatible with mobile devices, but we've seen that it just lacks most of the appeal that is present in the computer version. With that said, the graphics of the game are astonishing, and the sounds make it more immersive than most other online slot games.

Jewel Box offers players the chance to win with stacked lines, which means you don't need to have one of your paylines starting on the first reel. Instead, you can win rewards based on the number of jewels that get stacked together. It's a cool function, which also makes the game easier to understand in the eyes of those with little experience in slot games.

The game packs a solid 95.79% RTP, which keeps it up there with some of the best online slots on the internet in terms of return rates.

Always look for the emeralds and diamonds in the game! These are often associated with the best rewards you can get. Although you can earn more money with these two types of jewels, your chances of growing your wallet with smaller wins are also gigantic.

Simple Rewards, Awesome Wins

The rewards on this game are very simple to understand, easy to get, and won't give you much of a problem when selecting them. You get presented with three options, each offering a different reward – this will remain hidden until you complete the small game, allowing you to boost your rewards and earn a good amount of money while doing so.

To be completely honest, Jewel Box isn't the most complex game, nor does it come with a ton of extra content. Regardless, it offers users the chance to win big with small bets and a little luck!

9. Vikings Go Wild

Follow the Vikings' epic adventure to fight a monster in this Nordic-themed game, brought to you by the popular publisher Yggdrasil. You can bet any sum of money that you like, ranging from less than €1 per spin up to €50.

We know how good music could make or break a game, and Vikings Go Wild gives you an epic feeling of immersion that not many other games are able to offer. With that said, the art is relatively silly and cartoonish, but seeing as it's very well drawn, many users have grown to love it.

You can't make a ton of money on a single line, as you could do in other games. However, you can indeed earn a ton of cash by winning multiple small bets in a row, something that this game seems to allow constantly.

Even better – Vikings Go Wild has a sticky wild option, where you can keep watching the reels spin and spin as long as you keep getting the same figures repeatedly. The game's above average RTP of 96.03% keeps it appealing to all players and as entertaining as these games come.

Constant Free Spins and Bonus Features

Netting big wins and paylines in this game means that you'll be constantly fed with more free spins. As we said, wins might not be as big as they are in other games such as Holmes and the Stolen Stones, but the amount of free spins does make up for this fact. The game constantly varies in shape, making it very hard to get bored of playing it.

If you love Vikings and feeling part of something greater than yourself, this game is probably for you.

10. Jack Hammer

Are you a fan of comic books? This astonishing 5-reel, 25 payline game is all about the old artistic style used to create the comic books of yore. Follow Jack Hammer's mission to stop the evil doctor from destroying the city, saving citizens from danger and earning you some amazing bonus wins that you'll surely love.

The game's theme is one of the cleanest we've seen. The design of the panels is incredible, and it definitely helps you reminisce those old comic books that your grandparents probably owned. With a solid RTP of 97%, this game is sure to take you back to the good old days when you felt that money literally grew on trees!

Developer NetEnt has done an incredible job with this game, innovating with cool features such as sticking figures within one spin, which create the chance for some juicy bonuses. Such a feature is what we call a Sticky Win, an uncommon feature to see in such a popular slot game. Regardless, it gives the game a different twist that many other casino games fail to offer.

The amount of paylines that the game has gives you the chance to earn a massive amount of money with each spin, but you might also have to wager a ton if you want to hit those big wins. If you manage to do it, you'll be making a profit of up to 3,000 times the original amount that you first wagered.

It's All About Free Spin Scatters

You can earn free spins by having a few scatters spread across the entire board. If you manage to earn more than 20 free spins, you'll be playing for free for quite some time thanks to the sticky win we mentioned before.

Free spins also come with bonus multipliers – earning them could boost your profits like no other slot game manages to do. All the features work well when stacked together, which is a good representation of the overall feel that Jack Hammer offers to its players. You can dive into the action on your mobile phone, tablet, or computer right away.

What are Casino Slots?

Now that you know the basics about casino slots, let's talk about what they truly are and how they work. We'll attempt to clear up the air regarding casino slots, as there's plenty of misinformation thrown around that confuses players and generates uncertainty regarding these games.

Online casino slots use a special mathematical program, which is often called a 'random number generator'. These programs can create a different sequence of numbers every time that you click a certain button – in the case of online casinos, the number is generated each time that you click the button to spin the wheel.

The numbers are always being thrown around when you open the game, but it's only when you finally click the spin button that a specific number will be assigned to your roll, and it will produce a result (which is the spin, shown in the symbols present in the reels).

Most online casino slots use a system of 5 reels, which offer a ton of paylines thanks to the great number of results that you can get from them. When you spin the reels, a number gets assigned to each individual column (or line, depending on the type of slot that you're playing). This is what determines the result of your roll.

The Importance of Choosing a Reliable Casino

Isoftbet free slots. This all sounds good, but how can you know if the casino isn't cheating on you? How do you know if the number is truly randomly generated? There's only one simple answer for this: you truly don't. But fear not, it's not as bad as it sounds – experts do know how to test these games to make sure users from all around the world are not being cheated out of their money.

Thus, you have to make sure that the online casino that you choose to play has been checked and endorsed by a trusted company. Most of the big casino sites have been fully evaluated by experts, so you shouldn't have to worry about it if you're starting your online gambling career in a well-known casino.

However, if you plan on starting a new account on a recently-founded online casino, you might want to read customer opinions and judging whether the site is trustworthy or not.

Online Casinos – What Are the Most Popular Types of Slots?

3-Reel Slots

Three-reel slots are probably the types of slots that are most commonly seen in casinos, movies, and everything that aims to represent casinos in one way or another. This is because slot games started with 3-reel slots. These types of slots consist of three columns, each with its own set of symbols. Each reel stops whenever you pull a lever or click a button, depending on the RNG we mentioned before.

These are the best types of slots for you to play if you've never used slot machines before, as they're very simple to understand and you can make a good amount of money playing them.

Video Slots

Most online casinos have video slots as their most popular type of games. These slots are very versatile, and as such are also the most creative when it comes to symbolism and themes. Video slots have a minimum of 5 reels, and they're the most entertaining type of slot games once you get the hang of them.

Top 10 Online Casino Slots Game

Video slots have more features than their 3-reel counterparts, such as the addition of extra rounds, free spins, progressive jackpots, and a ton of additional bonuses.

Everything You Need to Know About Slot Paylines

A payline is the sequence that you bet for when playing a slot game. For example, you could play a single payline or you could play them all. The more paylines that you play, the bigger your chances to win will be. Playing more than one payline of course means that you'll have to pay more money, but it could be worth it depending on the slot game that you're playing.

As such, there are single and multiple paylines that you can play, and it's up to you to decide how and when to play them.

Online Slot Symbols – What Do They Mean?

Top 10 Best Online Casinos

The first thing you'll notice in slot games is that the symbols are always different, depending on which game you play. However, most of these symbols still represent the same things. These are the types of symbols that you find in most slots:

• Wild – Wild symbols are there to help you complete any winning combination that you could get. For example, you could see it as the equivalent of the joker card in most card games
• Scatter – Scatters are the easiest types of bonuses that you can win. They will usually give you a reward when three or more of them are showing, even if they aren't on a specific payline
• Bonus – Bonuses are different in most slot games, but they usually need to be showing in a payline for you to get the rewards
• Multiplier – A multiplier does what it says – it multiplies the price of any payline that you won by the number it shows on the symbols. Thus, they can turn your €25 into €100!

The Best Online Casino Slots – Go and Play Now!

Enough of explaining, though. It's time for you to find out what are the best casino slots to play in 2021 so you can dive straight into the action! Visit the best online casinos in the world to claim the best casino bonuses available and play these slots for free.