Online Slot Games & Video Slots

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Online slot machines are incredibly popular right now. Many avid gamblers who used to visit land-based casinos have switched to video slots. It is quite reasonable since gambling websites offer an amazing gaming experience. Thanks to them, you can play thousands of top-notch slots for any taste from the comfort of your home. It is extremely convenient! They allow playing anytime you want without any restrictions.

If you want to enjoy the best online slots, you have come to the right place! Real money online casino - Ra.Casino, features hundreds of games from the most reliable software providers. On this website, you can try free slots for fun right now. Those who want to test their luck can play casino games for real money. All the games are available straight from the web-browser. You will not need to install questionable software or plugins!  

Every single slot machine presented at Ra Casino can be played on both PC and portable devices. Mobile casino slots are completely identical to their desktop counterparts, which means you will get the best gaming experience regardless of the platform. Play your favorite games of chance anywhere you want at any time! Just open the Ra Casino website on your mobile browser and start to play right away.

Casino Slots: What is It, Game Types and How to Play It

Slot machines have been around for centuries. These fun and colorful games of chance remain the most popular type of casino attraction since the origins of gambling establishments. They are very simple but extremely entertaining.

Every single virtual slot uses a random number generator. It creates random sequences of numbers. Modern slot machines do not have memory, so there are no trackers to record your win rate. Nowadays, all slots are instant. Their outcomes are determined in real-time based on mathematical algorithms communicated through the RNG. It makes slot machines fair and gives every player a chance to win.

Remember that all the slots are based entirely on luck. There are no winning strategies that would allow you to win all the time. However, slot machines have a different return-to-player rate, which indicates how much money you will return out of all your bets. In other words, the higher the RTP — the better.

We have listed the most interesting and important facts about slot games below.

History of Slot Machines: From One-Armed Bandits to Video Slots

The very first mechanical slot machine was invented by Charles Fey at the end of the 19th century. It was called the Liberty Bell and had three reels. It only had four symbols: diamond, heart, spade, and a cracked Liberty Bell. You could have win 10 nickels by landing three symbols of Liberty Bell in a row. Even though the game was very simple by modern standards, it had the same rules as the newest slots.

Besides that game, car mechanic Charles Fey has also created other slots such as Draw Power, Three Spindle, and the Klondike. They quickly became very popular, making the creator rich. He rented his creations to different saloons and bars in exchange for a percentage of profits. The demand for Charles’s slots was so high that he stopped repairing cars. Even so, he could not build new slots fast enough.

Eventually, other manufacturers started to knock-off the popular slot. One of the most successful businessmen was Herbert Mills, who began production of the Operator Bell slot in 1907. It was nearly identical to the original. By the way, Herbert was the first person to use fruit symbols as slot symbols. As you probably know, many classic slots have fruit symbols because of that.

The first electronic games appeared in casinos many years later. The first slot video game was called The 21 machine. It was released in 1964 by Nevada Electronic. Many other electronic versions of popular games followed in the next years. The first electronic slot machine was released in 1975. It was created by the Fortune Coin Company and looked very much the same as the modern machines.

The next important milestone in the history of gambling is the 1990s. The very first online casinos started to launch during these years. Just like land-based establishments, slot machines were the most played type of games on the internet. In 1996, less than 20 slots were available online. Most of them were classic 3-reel slots developed by WMS Industries. This company continues to create slots up to this day.

Types of Slot Games

There are myriads of different slot machines. They can be divided into the following categories:

Fruit Slots

Machines of this type feature traditional fruit symbols, such as cherries, plums, and lemons. Usually, fruit slots have three or five reels, a different number of paylines, and bonuses.

Classic Slots

Games of this type are aimed at gamblers who prefer simple retro-styled slot machines. Most of the classic slots feature user interfaces that resemble traditional one-armed bandits with 3 reels, 5 paylines, and no bonus features at all.

Video Slots

These are modern online slot games with different themes. Usually, they feature unique symbols and bonus rounds. Most popular video slots have 5 reels, but there are many 3-reel and 7-reel options as well.

3D Slots

Online casino games of this type have great 3D graphics with smooth animations. These slot machines are very similar to other video slots, but they offer much better visuals and effects.

VR Slots

Virtual reality slot machines are among the most recent inventions of the gambling industry. They need to be played with a VR headset. In terms of rules, they are completely identical to standard video games. For example, you can check the Gonzo's Quest VR by NetEnt to understand what VR casino games are.

Multiline Slots

As the name suggests, machines of this type come with multiple payout lines (at least 20). In fact, most of the modern video slots are multi-lined and feature dozens of paylines.

Megaways Slots

These slots have six reels and utilize an innovative format. You can get from 2 to 8 symbols per reel and have a minimum of 243 paylines. The outcome of the game is dynamic and keeps changing all the time. You never know how many ways your next spin will be, which makes the game extremely exciting.

Jackpot Slots

From the gameplay viewpoint, these slot machines are no different to other casino slots. However, they feature large progressive jackpots. They keep increasing until someone wins it. The progressive jackpot is reset to the predetermined values after someone wins it.

As you can see, the selection of slots is truly huge. There are hundreds of options to choose from! Fortunately, the collection of Ra casino features slots of every type. All slot machine games presented on the website are available in the demo mode. Feel free to try them out right now!

Bonuses and Features

The vast majority of modern online casino slot games offer bonus features that improve the gameplay. Thanks to them, you can significantly increase your winnings. Below, we have listed the most popular types of bonuses that you might encounter in online slots.

Scatter Symbols

This type of special symbols is used in slot machines to unlock exciting bonus features. Their main difference from the other symbols is that they do not have to appear on the payline. It has to appear anywhere on the playing field in order to offer your cash prizes, free spins, bonus rounds, and other benefits. In addition, scatters are typically among the most valued symbols in most online slot machines.

Most of the time, a specific number of scatters must land on the reels during the base round in order to trigger bonus rounds or other features. You can check the Help section of the game to clarify the details. When the needed number of scatters appears on the playing field, the game will grant start a bonus feature. This can be either free spins, cash rewards, or any other interactive bonus round.

The exact benefits of scatters depend on a game. In some slot machines, they only offer an extra cash reward, while in the others they vastly increase your winnings. That being said, even a small amount of extra money is good enough when you are playing for real money, is not it? Therefore, make sure the games you play have scatters if your goal is to maximize the winnings.

Wild Symbols

Wild symbols are featured in most of the modern video games. These special symbols are similar to jokers in a deck of cards. They serve as the highest-valued symbols in the game. Wilds can replace any other symbol (except for other types of special symbols) to help players build winning combinations. Therefore, slot machines that feature wild symbols usually offer a higher RTP.

Wild symbols land on the playing field at random, so there is no way to control their appearance. Nevertheless, they only appear on certain reels in some slots. For instance, wilds always appear on the middle reels in some slots from NetEnt. Check the game’s rules to identify where the wild symbols appear and what do they do. These factors can vary drastically from slot to slot.

Besides traditional types of wilds, some machines feature the following variations of the special symbol:

  • Expanding Wilds. This variation substitutes all the symbols on the reel, turning them into wilds. Potentially, they can generate several wins at once during one round. As a rule, expanding wilds can only land on certain reels (such as reels 2, 3, and 4).
  • Sticky Wilds. These are super lucrative wilds that hold in place for a few spins after landing on the playing field. Usually, this feature leads to amazing winning combos.
  • Shifting Wilds. This type of wilds is similar to sticky ones. They stick on the playing field for a few reels. However, they change positions every time. Shifting wilds can help you create extremely lucrative winning combinations.
  • Walking Wilds. This type of wilds offers you free spins every time they substitute a symbol on the reels. When you activate this feature, it will walk one position left or right and grant you a free spin. The process will repeat until the walking wilds leave the playing field.
  • Stacked Wilds. They then land on the playing field, they cover the whole reel at once. Sometimes stacked wilds can appear on every reel. However, in most games, they only land on specific reels. Many slots that have the possibility of getting stacked wilds on every reel have high variance.
  • Random Wilds. Wilds of this type are very similar to the standard ones. However, they appear at random depending on the theme and structure of a specific slot.

Free Spins

This type of bonus allows you to spin the reels extra times without betting your own money. Usually, it is activated by a specific amount of scatters, wilds, or bonus symbols. In some slot machines, you can re-trigger this feature and win even more cash for free.

Gamble Feature

Some casino slots real money allow you to double your winnings with a gamble game. Usually, you will need to guess the suit or color of a facedown card. If you make the right guess, you will double your prize. Otherwise, you will lose everything. You can activate this feature yourself after the base game.

Cascading Reels

Cascading reels are a cool bonus feature made to increase your win rate. After the symbols appear on the playing field, all the winning lines explode to replace them with new symbols. If the replacement symbols create new winning combinations, they explode too, and so on. Potentially, you can win a lot of money thanks to this feature.


The most advanced video casino games feature multiplier symbols that multiple your overall winnings by a certain number. For instance, when you get a 2X multiplier symbol and hit the payline, your winnings will be doubles. As you might have guessed, slots with the multiplier are usually very lucrative.


This feature gives you a second chance to hit the winning combination. You will need to pay for it, but you do not need to do that unless you want to. However, if you have nearly hit a winning combination, this feature might come in handy. Thanks to it, you can spin a single reel while keeping the rest of the playing field intact. The cost of respins depends on your potential winnings. The higher the cash prize you can get — the more you will have to pay.

Nudge and Hold

These features are very common among fruit slots. The Nudge allows you to move a single reel down by a single position to form a winning combination. Slots that offer this feature also have the Hold function. It allows players to fix a single reel in place before continuing the game. Both of these features are given out at random and can be activated by the player anytime they want.

Progressive Jackpot

The progressive jackpot keeps increasing every time players play the slot. A small portion of each bet is added to the jackpot after each game. In comparison to slots with fixed jackpots, progressive jackpot games have tougher odds. However, you can win life-changing amounts of money if you get extremely lucky.


This bonus feature offers the player to pick one of the many objects to reveal various rewards. Usually, you can pick as many times as you want until you reveal a stopper, which will end the bonus round. Click-n-Pick feature is very popular among 5-reel slots.

How to Play Slot Machines: Rules and Tips

After choosing a suitable game, one can study its paytable to find out how much each symbol is worth. Additionally, games offer information regarding odds and different bonus features such as free spins or bonus rounds. If the slot has a bonus symbol, you might get free spins or extra cash prizes during the game. Usually, you need to land a specific number of special symbols in order to trigger a bonus round.

The user interface depends on the specific slot machine and software provider. Fortunately, the controls are intuitive most of the time. You can read the rules by clicking the “Info” or “?” button, change the bet using the “+” and “-“ buttons, adjust volume and sound effects using a slider or the “Mute” button, and finally, yet importantly, spin the reels using the “Play” or “Spin” button. Additionally, most slots offer the “Autospin” button, which allows you to spin the reels automatically the chosen number of times.

As soon as you are ready to play the one-armed bandit, choose your wager. Some casino slot games allow you to select the number of paylines to play. Do not lose your mind and never bet more than you can afford to lose! Set a budget in advance and stick to your sum. Otherwise, you might quickly lose significant amounts of money. Play responsibly if you want to keep gambling fun!

What is the Best Time to Play Slots?

Many novice gamblers believe that the best time to play internet slots is at the end of the month. They think so because calculations between affiliates and the majority of gambling platforms run from the first day of the month to the last day of the month.

Nevertheless, it does not actually increase your chances of hitting a big win. A huge jackpot can be won by any other player at any time while you are trying to find the best moment to play. Therefore, there is no need to wait if you want to have some fun playing games. Just do it.

In fact, the best time to play is after you are fully aware of the slot machine’s rules and understand that you can lose your bet. Whether you a high roller or a low roller make sure to carefully read the rules and never bet more real money than you can afford to lose.

What is RTP and Variance (Volatility)?

If you have read any slot reviews online, you have probably seen the terms “RTP” and “Variance”. Let us see what they actually mean.

RTP (Return to Player) is a theoretical measure of the sum of money a specific slot pays back over time. For instance, if the interest rate of the slot is 7%, then the RTP is 93%. On average, after numerous spins, 93% of the total wagered amount will be returned to the player. The rest will be left in the machine. In other words, if you make a bunch of small bets for a total of $100, most of the time you will return $93.

As to variance or volatility (these terms are interchangeable), this measure shows how risky a slot machine is to play. It can be low, medium, or high. A low variance slot returns money more often but n smaller amounts. Slots of a higher variance are riskier to play, but they offer higher wins.

It is up to you to decide what variance is better. If you like to play but do not want to wager too much, a low-volatile slot is a better option for you. Those who like to test their luck and win large sums at once should pick high-variance games.

Popular Playing Strategies

There are no playing strategies that would make you win at slots all the time. However, you can slightly improve your win rate by following these simple recommendations. Below, we have listed some of the most effective playing strategies.

Always Play Within Your Budget

Sometimes you will end up your playing session losing money. Unfortunately, you have to put up with it. Never bet more than you can afford to lose! Otherwise, you might turn your game session into a nightmare. Make sure you are playing slot machines that fit your bankroll.

If you want to enjoy slot machines for at least three hours, your gambling bankroll should cover 250 bets. Therefore, you should have at least $250 in order to play dollar slots. Otherwise, stick to penny slots or be prepared to walk away within the first hour.

Play Higher Denominations

Play higher denomination in order to increase the likelihood of hitting a winning combination. Always choose slot games with higher denomination bets available since these games offer the highest chance to give you a payout.

Payback percentages of slot machines are relative to the denomination of the wager, or the price of each spin. The higher the denomination, the higher the payback percentage. Therefore, you will have a higher win rate by playing slots with higher denominations.

Try Free Slot Machines in the Demo Mode

Do not play casino slots for real money if you have never tried them before. On Ra Casino, you can try every single slot for free with no registration. It allows you to test out different strategies and get used to the rules. You will be able to find the optimal wager and get the most value out of every dollar.

Playing slots for free with no deposit is not only saving you the real money. In addition, it is a good way to check whether the game is worth your time and money. If you do not like a slot machine, you can just close it right away without worrying about the lost money.

Stop at the Right Time

You can earn money and have a lot of fun with slot machines. However, it is very important to stop at the right time for it to stay that way. Determine the goals of each playing session in advance. Decide how much money and time you are willing to spend and stick to that plan.

Stay responsible to avoid losing a ton of money. Video slots can be extremely exhilarating sometimes. That is why you need to set certain limits before you start playing. This way, you will be able to stop before spending too much money.

Make Sure You Are Betting Enough

If you are playing progressive slots, make sure that you wager enough to be eligible for the jackpot. Such games usually have a single progressive jackpot on the top payoff. Players must make a bet of a specific amount in order to have a chance of winning the biggest prize.

Tree-coin dollar slot machines, for instance, require you to bet three coins in order to win the jackpot. Otherwise, you will not get it even if you win. Betting only one or two coins, in this case, will bring you a reduced payoff at a fixed amount.

Considering the above, you should not play progressive slots unless you can afford to make high bets. That is the only way you can win the jackpots. Choose non-progressive slot machines if you are not willing to make the max bet every spin.

Free Slots Online Without Downloads and Registration

One of the best things about Ra Casino is that every slot from the game collection is available in the demo mode. Feel free to try over a thousand slot machines without paying a single dollar! We have listed the most important advantages of free slots below.

Learn to Play with Free Slots

Free slot machines presented on Ra Casino offer the best way to gain experience. It is especially important for gamblers who are not familiar with online casinos. If you have never played slots over the internet, free games will help you to learn the basics and figure out how everything works.

Every single free slot offers the same gameplay as its real-money counterpart. Everything you learn while testing the game in the demo mode can be used later on when and if you decide to play for real money. That is why we recommend every new player to play for free before making a deposit.

Play for Fun

Obviously, casino games are meant to be entertaining. All the modern slots offer amazing graphics and exciting gameplay. Free slots are extremely fun! You do not even need to pay in order to play them. Of course, taking risks makes them even more entertaining, but you do not have to do it.

Most gamblers who have ever played a free slot game know that they are packed with exciting bonus features, jackpots, special symbols, and other exciting stuff. You will get a great gaming experience playing them! Free slots on Ra Casino are perfect for those who want to have some fun.

Do Not Risk Losing Money

Free slot games allow you to eliminate the risk of losing funds. It is especially important for novice players who are not ready yet to play for real money. At Ra Casino, you can enjoy everything slot games have to offer without making a single deposit.

You will never run out of virtual coins when playing games in the practice mode. Therefore, you will be able to play as long as you want without depositing any money. Just as we have mentioned earlier, every single slot is available for free, so your choice is huge.

Test Different Strategies and New Tricks

Free slots offer you limitless possibilities to test out different strategies. Implement new tricks, try different betting options, and find the most lucrative games. You can pick a decent slot machine and play it for real money any time you want. Master a playstyle with free games and put it into practice!

This way you will find out the differences between slot machines of different volatility, as well as playing with low stakes and making the highest wagers. Since you are not risking your own money, you can try any strategy that comes to your mind.

Slot Games for Real Money at Ra Casino: Get Your Jackpot Today!

Even though free slots are very entertaining, you will get even more fun by playing for real money. High stakes can make any game more exciting! With Ra Casino, you can win huge cash rewards while playing your favorite slot machines. Why playing for fun when you can earn money doing what you like? If you consider yourself a serious gambler, sign up at Ra Casino and make a deposit right now!

As soon as you register, add funds to your casino account using any deposit options you want. Ra Casino accepts PayPal, credit cards, cryptocurrency, e-wallets, and many other payment methods. Your funds will be added to the casino account immediately. Additionally, you will get a very generous welcome bonus on the first deposit that can be used on any slot machine from Ra Casino’s collection.

Our gambling platform is available all over the world. We are especially happy to welcome players from Asian countries, including:

  • Malaysia;
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  • Singapore;
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You can make deposits in your local currency without any restrictions in MYR, IDR, JPY, TWD, THB, KRW, CNY, HKD. On top of that, Ra Casino accepts BTC, ETH, and other cryptocurrency deposits. All slot machines presented in the Ra Casino’s collection come with flexible betting options. They are suitable for both low rollers and high rollers. Therefore, every visitor of our gambling platform has a chance to win enormous jackpots with the minimum risks!

Mobile Casino Slots: Play Slot Games on Android and iOS!

Every game available on Ra.Casino is optimized for both Windows and Mac, as well as portable devices on iOS, Android, and other operating systems. The website works very smoothly on all smartphones and tablets! Portable and desktop versions of the slots are 100% identical. You will get the best gaming experience no matter what platform you prefer, which makes Ra Casino perfect for avid gamblers.

You will not need to install any additional apps or programs in order to play. Ra Casino utilizes responsive HTML5 design, so you can enjoy free mobile casino slots straight from the browser. All you need for a comfort play is a device with internet access (you cannot play offline). Feel free to try any casino games presented on the website anytime and anywhere you want without any restrictions!

Best Online Slot Machines and Providers in Asia and Europe

Ra Casino is powered by the most reliable developers in the gambling industry. They offer the best gaming experience you will ever have! Feel free to try games from the worldwide-known software casino game providers such as the following:

  • Microgaming;
  • NetEnt;
  • Big Time Gaming;
  • IGT;
  • Playtech;
  • Quickspin;
  • Play'N Go;
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Additionally, our website features video slots from the most popular Asian developers, including:

  • 918kiss (SCR888);
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Play the hottest slots machines from trusted developers with exciting gameplay and high RTP!

Legal Online Slot Games with Bonuses on Ra.Casino - Your Best Choice to Gamble!

Ra Casino strives to offer gambling experience of the highest quality for every visitor. The website features dozens of benefits for both novice and experienced gamblers. Sign up at the platform right now in order to get access to the following advantages:

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Ra Casino is licensed and regulated by the authorities of Curacao, so it is 100% fair and safe. Moreover, website utilizes the SSL technology to ensure the confidentiality of every user. Your personal information is kept secure from third parties. Your identity will never be compromised!

Given all the advantages of Ra Casino, this gambling website is hand down the best solution for any gambler. Create an account right now to claim a generous welcome bonus and play the best casino games for real money!

Slot Games FAQ

Сan I play free slots online at Ra Casino?

Yes, you can! Every single slot machine presented on Ra Casino is available in free demo mode. It means that you can play games as long as you want without using your real money. The slots are available straight from the browser without registration.

How to win real money playing slot machines?

Register at Ra Casino in order to play for real money. The registration process is very simple and takes less than 10 minutes. You will need to share some of your personal information and make a deposit. Claim the welcome bonus and start playing slot machines for real money straight away!

Am I need to download a slot game to play?

No, you do not have to download anything. As it was mentioned earlier, the entirety of Ra Casino’s collection is made with the use of HTML5 technology. Unlike flash games, they are available on all devices straight from the browsers without additional software or plugins.

Can I play mobile slots on Android or iPhone?

Sure! Ra Casino is fully optimized for portable platforms. Just open the website on your smartphone or tablet and enjoy any game you want. No apps required!

Can I get bonuses in slot games?

Yes, you can! Ra Casino features over a thousand of great video slots with exciting bonus features. If you prefer to play for real money, they can significantly increase your chances of winning a huge reward.

What are the most popular slot games and providers?

Ra Casino features slots from the best game developers in the gambling industry, including Microgaming, Quickspin, Blueprint Gaming, NetEnt, Big Time Gaming, IGT, Playtech, Play'N Go, and Pragmatic Play. Additionally, you can try games from the most popular Asian providers such as 918kiss (SCR888), Joker Gaming, Asia Gaming, SpadeGaming, and Red Tiger.

What is RTP?

RTP (Return to Player) is a theoretical measure of the sum of real money a slot machine pays back over time. The higher the RTP, the better. The most lucrative slot machines offer RTP of 95% and higher.

Are online slot machines rigged?

No, they are not! Every single slot machine on Ra Casino has been proven fair by independent audits. Rest assured that all players have a chance to win!

What are Min. and Max. Bets?

Min. and Max. bets are the minimum and maximum amounts of real money that you can wager in a slot machine. Most of the slots presented on Ra Casino feature flexible betting options.

Which slot has the biggest payout?

Slot machines with RTP of over 95% offer the highest payouts. Ra Casino features hundred of such online games. Feel free to play any slot you like!

Are online slots legal?

Yes. Ra Casino is officially licensed by Curacao Gaming and offers licensed slot machines from popular software developers. You can legally play games of chance on our website.

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Ra Casino - is a trusted online casino in Asia and Europe. Here you can find best slot games, live dealers (Live Casino), various types of card games (Poker, Blackjack, Baccarat) and table gambling games (including Sic Bo and Keno). As a licensed internet casino, Ra.Casino provides only licensed gambling soft from providers: NetEnt, Microgaming, Playtech, Quickspin, Habanero, and many others. Register now and enjoy our generous bonuses, tournaments and promotions, quick withdrawals and fair gameplay!

Ra.Casino is owned and operated by Esports Kingdom LP, Ireland (registered address: Office 29, Clifton house, Fitzwilliam Street lower, Dublin 2, D02 XT91, Republic of Ireland). Esports Kingdom LP (Ra Casino operator and regulator) operating under the Master License of Gaming Services Provider, N.V. #365/JAZ issued to Curacao Gaming by the Government of Curacao.

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