Europe's Best Real Money Online Slots [2021]

Welcome to our slots page! 🎰

Remember that there is no such thing as the 'best online slot' because every player has a unique taste and preference! Some prefer simple games, while others want them fully loaded with dozens of bonus rounds, modern design and high win potential features. Therefore the best for you may be the worst for someone else. Nevertheless, based on our experience and information we gathered from the top casino forums in Europe, we put together a list of the top 10 online slots that are considered the most popular across all online casinos in Europe and beyond. These are games that players love to play, making casino management put them in the most prominent spots.

Top 10 Online Slots
Slot' Name Provider Return to Player (RTP) Volatility
Book of Dead Play'n GO 84-96.21% High
Jammin Jars Push Gaming 96.83% High
Bonanza Big Time Gaming 96% Mid/High
Deadwood  NoLimit City 96.02-96.03% and 94.14-94.15% High
Dead or Alive 2 NetEnt 96.82% High
Money Train 2 Relax Gaming 96.4% High
Razor Shark Push Gaming 96.7% High
Lucky Lady's Charm Novomatic 95.13% Medium
King Kong Cash Blueprint Gaming 95.79 % Medium
Gonzo's Quest™ Megaways™ Red Tiger Gaming 96% High

∗ Please note, most of these slots have high volatility, if you prefer something less risky, we recommend trying medium or low volatility slots such as NetEnt’s Bloodsuckers II or Toki Time by Thunderkick (97.1% RTP). Gamble responsively!

Before we get started on the list, let us talk about what makes an online slot great.


#1. Paylines and Payouts – One of the most fundamental factors for an excellent online slot is to have pay lines that go all the way across the reels bringing a decent return in case of a win. The more lines you generally play, the greater the chances you have of winning. More lines mean that you win more often. Of course, payouts and the number of pay lines offered depends on the game, but the basic rule of thumb is to look for a slot with at least 10 pay lines and a decent potential of winning opportunities.


#2. Bonuses and Features – Another significant part of an online slot game is getting great bonuses with excellent bonus rounds and unique features. These add immense excitement to the gameplay and make the game more enjoyable. Some bonuses that players love include free spins bonus games with sticky wilds symbols or slots that feature a random multiplier. Therefore lookout for the scatter symbols, free spins and wild symbols. These determine your chances of winning and how much money you will have whenever you play.


#3. Jackpots – An added progressive jackpot is what really makes some players go crazy because progressive slots can produce enormous amounts of money, and it only goes up as more people play on them.


#4. Theme – The theme is also something to look out for. In most cases, modern slots have some kind of story or even the entire concept behind them. The more exciting the theme is, the better it will be for players to enjoy. Also, a great concept design gives you an idea of how good the graphics will be.


#5. Graphics – The visuals of a slot game are as important as the audio effects. This is because graphics also play a significant role in bringing things to life. You want to see symbols spinning around and colours that go from one extreme to another. More importantly, you want the slot game itself to be entertaining and leave a lasting impression in your memory even after the gameplay is over. The top slots generally have outstanding graphics as a result of technological advancement.


#6. Audio Effects – Most online slots tend to have very appealing audio effects that players enjoy. Sometimes, soundtracks play for players as they spin their reels or weird sound effects like ‘Wheezing Dragon’ that acts as a bonus game trigger.


Now that we’ve explained what it takes for an online slot to be great, so now let’s take a look at the best slots online and casino sites where you can play them. 🚀

Best Online Slots' Casino Sites for You

The following table includes some of the best EU online casinos offering over 2,000 high-quality real money online slots, fast withdrawals, and complete security so you can play all of your favourites or try some of the top slots listed above safely and without worry. For detailed information about each casino site listed, click on their logo, and you’ll be taken to the casino review page with more details, including first deposit bonuses, VIP benefits, available games, software, payment methods, screenshots and more. And If you would like to see a complete list of the top-rated online casinos, then head over to our homepage.

Best Online Slots' Casinos
Casino Slot Site Top New Slots Welcome Slot Bonus Secure Link
Bitstarz Casino Big Bass Bonanza
Wolf Gold
Wild Spin
Crystal Classics
Elvis Frog in Vegas
100 EUR + 180 Free Spins
[WR: 40 × Bonus]
Visit Bitstarz ➟
N1 Casino The Dog House
Book of Dead
Fruit Million
Ramses Book
Poseidon's Rising
100 EUR + 150 Free Spins
[WR: 50 × Bonus]
Visit N1 Casino ➟
Casino Friday Fruit Party 2
Chicken Drop
Rise of Giza Power Nudge
Book of Vikings
5 Lions Megaways
500 EUR + 200 Free Spins
[WR: 40 × Bonus]
Visit CasinoFriday ➟
Gslot Casino Deadwood
San Quentin xWays
Punk Rocker
Hoarder xSplit
100 EUR + 100 Free Spins
[WR: 40 × Bonus]
Visit Gslot ➟
Slot Hunter Casino Book of Skulls
Hugo Carts
Towering Pays Valhalla
100 Lucky Chillies
Gslot Queen Of Fire
100 EUR + 150 Free Spins
[WR: 50 × Bonus]
Visit Slot Hunter ➟
Fight Club Casino Jammin Jars 2
Buffalo Power
Temple Tumble
Gates of Olympus
15 Dragon Pearls
100 EUR + 150 Free Spins
[WR: 50 × Bonus]
Visit Fight Club ➟
Vegasoo Casino Book of Dead
Big Bass Bonanza
Thunderstruck 2
300 EUR + 50 Free Spins
[WR: 50 × Bonus]
Visit Vegasoo ➟
Casimba Casino Neon Links
Chilly Heat Megaways
Alive Megaways
Hugo Carts
Bonus Fruits
5000 EUR + 50 FS
[WR: 35 × Bonus + Deposit]
Visit Casimba ➟
Fun Casino Crypt of the Dead
Book of Gods
King of the West
Chilli Heat Megaways
Break Da Bank Again Megaways
up to 123 EUR
[WR: 50 × Bonus]
Visit Fun Casino ➟
Spin Rider Casino Toshi
Luck'O Mega (exclusive)
Punk Rocker
xWays Hoarder xSplit
Book of Dead
3000 EUR + 50 FS
[WR: 35 × Bonus + Deposit]
Visit Spin Rider ➟
Novibet Casino Deadwood
San Quentin xWays
Punk Rocker
Hoarder xSplit
--- Visit Novibet ➟
Jackie Jackpot Casino Big Buffalo Megaways
Fishin Frenzy The Big Catch
Book of Itza
Big Bass Bonanza
Fruit Party 2
200 EUR + 100 Free Spins
[WR: 35 × Bonus]
Visit Jackie Jackpot ➟
∗ Bonus terms apply. Last updated on 01/08/2021 by

We hope this list of best online slots sites will help you choose the right place to play your favourite game, whether you like it for free or for real money. As you can see, these top sites offer a wide choice of new games along with slot bonuses for those looking to extend their playtime. However, all these casino slot offers have specific terms and conditions attached, so it’s essential to read and understand them before making your deposit in order to enjoy your favourite slots’ action safely.

List of the Top Slots Online that Slots Fans Play the Most

The following list will provide you with more information on the top online slots that are taking the most attention from casino gaming fans across online slot sites in Europe (and not only), along with direct links to the best slot sites where you can try them out free or play for real money. Each game is followed by its details, including the developer and the slot bonus features, so that you can get a better idea and choose the perfect game for you. You’ll also find more casino sites to play slots further down the page.

Rich Wilde and the Book of Dead logo

Book of Dead by Play'n GO

Play'n Go's Book of Dead online slot was inspired by Novomatic's Book of Ra slot game and was released in 2016. They had no idea it would become one of the best European slots online. The base game features 5x3 reels set with 10 pay lines, and the free spins round packs quite a punch with wins of up to 5,000× your stake.

The Book of Dead Bonus Feature

Getting three or more scatter symbols will trigger a 10 free spins bonus game, which can be retriggered indefinitely. In each bonus round, a special expanding symbol is randomly selected from the regular payout symbols. The symbols will expand and pay for all pay lines when sufficient land on the reels (2 for the top symbols and 3 for all other symbols).


If you have “A” as a special symbol when three of them land it will pay 10 times the win for three-of-a-kind “A”s once for each pay line. The maximum win is awarded when all five of the top symbols appear on the screen.


The Book of Dead slot game may run at different RTP settings such as 84, 87, 91, 94 and 96.21%. Therefore, this percentage may vary based on the jurisdiction and the casino. So, be sure to click on a question mark within the game to be sure you’re playing the highest one.

Push Gaming's Jamin Jars online slot Logo with a 10x Multiplier

Jammin Jars by Push Gaming

The rather small studio called Push Gaming has a penchant for grid-style slots with high volatility. Quite a few of their games deliver regularly wins exceeding 10,000x the bet. Jammin' Jars was released in 2018 and has since become an absolute players favourite. The game features an 8x8 grid with cascading symbols and runs at a 96.83 RTP setting.

A cluster minimum of five symbols is needed to score a win, after which the symbols are removed, and new ones drop in from the top. The sequence continues as long as more wins occur after a cascade. The kicker on the game is the wild rainbow jars as they will not be removed but will increase their win multiplier by 1× whenever they are part of a winning cluster. Hit three within one spin sequence, and you’ll trigger six free spins which cannot be retriggered.


The current win multipliers on the wilds are transferred to the bonus round. They will keep increasing by 1× every time a wild is part of a winning combo. Contrary to the base game, the win multiplier will not reset to 1× at the end of a free spin but will keep growing until the end of the feature. When more than one wild is part of a combo, then they multiply by each other, sometimes leading to insane win multipliers.

Nonanza Megaways Online Slot by Big Time Gaming Logo

Bonanza by Big Time Gaming

The slot game Bonanza was released by Big Time Gaming in December 2016. Thanks to its unique Megaways game engine, with six reels each, filled with up to seven symbols, and a maximum of 117,649 ways to win, it has been quite popular among players in the casino community. You can play this legendary slot game on all the best online casinos.

The Bonanza Megaways Slot Bonus Feature

Randomly determined ways result in an indefinite quantity of reel or row combinations with every spin. Any time you land on a win, the symbols will explode, making room for new ones to appear. Once you receive another win, the chain reaction continues until no more wins are landed.


When you land four scatter symbols spelling out the word GOLD within a one-spin sequence, you will activate the free spins round. With each extra scatter, you’ll receive five free spins. After each winning reaction, the multiplier increases by 1×.

Deadwood slot game by Nolimit City

Deadwood Slot xNudge by NoLimit City

Deadwood is one of the most volatile online slots developed by NoLimit City with a maximum pay out of 13,950 times your bet. It runs at various RTP settings including 96.02-96.03% and 94.14-94.15% across different online casinos sites. Be sure you play the highest one.

Listed below are the available bonus features when playing this slot.


Hunter xNudge® Wild

This slot features the bounty hunters of Deadwood, a 4-row high Wild symbol on all reels that always nudges to full visibility. The Wild multiplier increases by 1 with each nudge. Several Wild multipliers combine for a total Wild multiplier on the line win for huge payouts.


Gunslinger Spins

The Gunslinger Spins are your chance for a bigger win multiplier that sticks to your winnings the entire session.


Hunter Spins

When you get three scatter symbols, you’ll be able to choose between two bonus games, each offering 8 free spins. As part of the Hunter Spins, at least one Hunter Wild is guaranteed to land on each spin, and the multiplier increases with each nudge of the wild.


Shoot Out

When two Sheriff badges are landed in the first and last reels, you will trigger the Shoot-Out feature, where all low-win symbols (A-10) will turn wild.


Shoot-Out Bonus Feature

During the Shoot Out Free Spins Feature, you can choose to play either the Hunter Spins or Gunslinger Spins. During these spins, all the low-paying symbols on the middle reels will act as Wilds.


Bonus Buy Feature

In Deadwood xNudge, a new promo feature – Bonus Buy – allows players to purchase free spins.

Two cowboys featured in Netent's Dead or Alive2 slot

Dead or Alive 2 by NetEnt

Dead or Alive 2, the sequel to the acclaimed NetEnt slot, debuted in March 2019 and has since been the top non-progressive slot for largest wins. The game has a maximum potential to pay 111,111× your bet in a single free spins round and has delivered it quite a few times since its launch.

The Dead or Alive 2 slot game has a 5×3 reel set with nine fixed pay lines, featuring wild substitutions as well as three types of free spins such as Train Heist, Old School Saloon and High Noon Saloon. Each with initially 12 free spins when a minimum of three scatters land in one spin. 


Train Heist comes with a progressive multiplier that starts at 1× and will increase by 1× every time a wild symbol lands on a free spin. Plus, it will award +1 free spin on each occasion. Get to a 16× multiplier, and you’ll receive five extra free spins.

Old School Saloon features a 2× win multiplier and sticky wilds. Any wild landing will stay in place until the end of the round. Get one wild on each reel to receive once +5 extra free spins.

• High Noon Saloon is the round where the really huge wins are scored as the sticky wilds come now with multipliers. Two on a reel will multiply by 2× and three by 3×. More than one wild symbol on a pay line is multiplied by each other, which can lead to a maximum multiplier of 243×.

money train2 online slot

Money Train 2 by Relax Gaming

Money Train is a popular bonus buy game, and a slot with a big win potential of up to 50,000x your stake featuring the Money Cart Bonus with Collector, Payer and Sniper. The game is available on all online slots sites.

For the bonus round to begin, you need to land a minimum of three bonus symbols anywhere on the reels. When the feature is triggered, you’ll have 3 free spins. Winnings in the feature are displayed as a multiplication of your bet, and the spin count resets to 3 after each new symbol appears. You’ll be awarded a win worth 500× your stake when all reels are unveiled and a symbol appears in every position available.


As part of the bonus, you may also see different paying symbols:


Persistent collector
Persistent Sniper
Persistent Payer
Reset Plus


Money Train’s 2 RTP is 96.40%.

Red logo of Razor Shark online slot

Razor Shark by Push Gaming

Razor Shark is one of the top online slots from Push Gaming that will test your nerves as well as your luck.The slot features a 5 × 4 layout with 20 pay lines and offers an RTP of 96.7 per cent. Observation of the highest win on this slot was 85,475×.

There is no doubt that Razor Shark is one of the best online slots in Europe, thanks to its impressive graphics, engaging sound, and a high winning potential bonus feature.


Razor Shark Bonuses

When you land three Mine Scatter symbols on a single spin, you win 5 Razor Shark free spins. During this free bonus feature, reels 2 and 4 are stacked. When the bonus is triggered, winnings are determined by the multiplier. 


Anywhere on a view, you may see four-stack seaweed. If it lands, the Mystery Stack feature will be triggered. You can also trigger the Razor Reveal feature if the Golden Sharks are revealed.


During Razor Reveal, every symbol in the Mystery Stack starts to spins and reveals a Coin that awards a multiplier. 


The Razor Reveal feature gives players a chance to win up to 2500 times their stake when a Golden Shark lands, and 25 times their stake when the orange one. The free game will end if there is no mystery stack of seaweed anywhere in the game.

lucky lady charm by novomatic

Lucky Lady's Charm Deluxe by Novomatic

The Lucky Lady's Charm Deluxe slot game is a five-reel and ten-payline game that became immensely popular when it was launched by Novomatic in 2010 and introduced in real casinos. The slot has a fantasy, mystic female theme, and its colour scheme ranges from pink to smooth cherry red. The Lucky Lady symbol substitutes for all symbols except scatters, and when it appears on a winning combination, the prize is doubled.

• The Lucky Lady’s Charm Bonus Game. The three scatter symbols (crystal balls/orbs) award 15 free spins and all wins during the bonus round are multiplied by three. You can trigger an additional 15 free spins when you land another three scatters during the bonus. The Lucky Lady’s RTP setting is 95.13%.

Play Video
The logo of the online slot King Kong Cash

King Kong Cash Online Slot by Blueprint Gaming

King Kong Cash is medium volatility—one of the best online slots developed by Blueprint Gaming, a leading slot development company based in the UK. This slot game has 5 reels, 3 rows, and 20 pay lines, and features the bonus games with free spins, wild symbols, and a whole array of other features.

King Kong Cash is among the best online slots UK. The game is packed with bonus features that can grant you anything from free spins to big multipliers of up to 500 times in a single bonus game. 


The main bonus game King Kong Bonus is activated when you land three or more King Kong symbols anywhere on the reels. There is no better bonus feature than the Golden Kong Free Spins (Big Money Bonus).


As part of this bonus game, you will have a choice of bananas to select. Uncovering a Golden Monkey symbol will award you with a multiplier between 10× to 500×. You’ll be able to keep choosing bananas until you find a bomb that ends the bonus game.

Play Video

Most players know that online slots have different variations, so let us introduce you to some of the most popular ones you can expect to encounter at the casino sites presented on this page. Generally, video slots are the most common type of online casino slots available. They offer the biggest payouts following the jackpot slots and are readily available on laptops, desktop computers and all versions of mobile casino sites.

The Most Popular Online Slots' Variations

Online slot games come in a wide range of varieties, offering both the novice and experienced slot player a vast array of choices when it comes to their preferred type of online slot machines. We’ve compiled this list to tell you about some of the most popular slot game variations available for you to choose from.

An xWays Hoarder xSplit video slot by Nolimit City

Video Slots

Without a doubt, the most popular type of slots online! They're taking the industry by storm and show no signs of slowing down. With a wide range of options available online these days, it's easy to see why they're proving so popular with players from all walks of life. Most of the slots you see across online casinos are video slots.

Classic Lord of the Ocean Slot

Classic Slots

The following most popular type of slots is those that make up the classic slots category. This kind of slots game has only a few reels and pay lines, offering players an extremely straightforward slot experience, giving them exactly what they want from their online casino experience.

An online slot Piggy Riches Megaways

Megaways™ Slots

Introduced by Big Time Gaming, Megaways™ slots are one of the most popular types of slots machines at online casinos and becoming more so every day. These games offer a different spin than traditional video slots by using many smaller symbols on each reel, still offering all the components you would expect from any video slot machine, including free bonus spins and random features.

Star Clusters Online Slot

Cluster Type Slots

This grid-style slot format is a recent addition to the online slot market but one that we think will prove popular over the coming years. These slots are made up of many small falling squares containing different symbols. The aim of this slot' gameplay involves matching groups of clusters adjacent to each other on the reels rather than symbols in specific lines across the reel.

Game of Thrones Online Slot

Branded Slots

Branded slots are usually top-of-the-line online slot machines. Generally, they involve a famous brand, person, superhero, movie or television serie within their game design. Some examples include Terminator 2 or Jurassic Park from Microgaming. Such games are typically provided only by the best slot providers and offer slot fans the chance to win big.

Mega Moolah Atlantean Treasures Jackpot Slot by Microgaming

Progressive Jackpot Slots

Progressive jackpot slots are much like branded video slots since they are provided only by the leading iGaming software companies. Take, for instance, Netent's Mega Fortune or Microgaming's Mega Moolah -- these are the biggest progressive jackpots in the industry that players can win and are offered to play only at the best online casinos.

Virtual Reality Slots

Virtual Reality slots are one of the most realistic slot games available online at present. These games offer players a virtual reality experience with awe-inspiring 3D graphics that create a fully immersive feel. All you need to try it out for yourself is a VR headset and a compatible device. You can then visit some of the top virtual reality casino sites like SlotsMillion and check out these incredible new online slot machines.

Real Money Online Slot Tournaments

A real money slot tournament is a popular type of competition among online slot machine players. They can play their favourite slot games with an extra opportunity to win exciting prizes for reaching the top of the leaderboard. Most races and tournaments are free to enter, and prizes are either cash, bonuses or extra free spins on selected games. Some slot casinos have taken the next step and offer buy-in races where players compete for real money and mostly higher prizes than those in free races.


The rules are as follows:

  • you compete to complete the most spins in a limited time 
  • you score the highest equalized win measured in a bet multiplier
  • you collect special symbols in the fewest possible spins


The following table shows you the best online casinos that offer real money slots tournaments online, along with the total prize money to be won.

Casino Sites With Slot Tournaments
Slot Tournament Site Tournament Options Total Prize Pool
Bitstarz Casino Welcome Freeroll
Table Wars
Slot Wars
Loyalty Program Tournament
N1 Casino Welcome Race
Grand Race
Free Spins Time!
Drops and Wins
Casino Friday Roulette Tournament
Black Jack Tournament
Mega Wheel Tournament
Baccarat Tournament
500,000 EUR
Gslot Casino Drops & Wins Slots
Drops & Wins Live Casino
Demi Gods Tales
500,000 EUR
Slot Hunter Casino Free Spins Hunt
Drops & Wins Slots
Drops & Wins Live Casino
7,000,000 EUR
Fight Club Casino Fast Fight
Big Brawl
Random Rumble
Drops & Wins Live Casino
Drops & Wins Slots
7,000,000 EUR
Jackie Jackpot Casino Skywind’s End of Summer Blowout 10,000 EUR
Fun Casino --- ---

Now you know what entertainment options await you when visiting those listed top-quality slots sites. Further down, you’ll find out about what iGaming companies are responsible for creating your favourite games along with a slots guide (knowledge base).

A small mini-bus delivers casino games

Best Online Slot Providers

Generally, the best online slots sites are powered by many popular slot developers, so the players can enjoy their provided online casino games in one place. Every slot fan has a personal favourite when it comes to the team responsible for building their favourite game. And each of the top developers strives to have their own unique style, theme, features and mechanics when it comes to making slots, and their latest releases are always awaited with anticipation. Therefore we've got a list of all the top online slot developers below so that you can get to know them better and plan your future spins accordingly.


This iGaming company has been around since 1980. Today Novomatic is the leading gaming technology group in Europe that constantly releases new real money slot games for online and land-based casinos. The Novomatic slots are prevalent among players who like playing no-nonsense games with great potential bonus features. Its top games are the legendary Book of Ra Deluxe, Lucky Lady's Charm Deluxe, Dolphin's Pearl Deluxe, Lord of the Ocean, Captain Venture, and more.


The next one on our list is none other than NetEnt, probably the most famous European slot developer, and they've been around since 1996. The company provides games using top-notch graphics combined with realistic sound effects to create truly immersive slots, and they've become known for being one of the best online slot developers to date. Some of the NetEnt top slots are Dead or Alive, Starburst, Gonzo's Quest, Hall of Gods, Guns N' Roses, Divine Fortune and many others.


Its portfolio covers a huge amount of games, from classic slot machines to video slots, progressive jackpots and table games. Some of the legendary are Mega Moolah, Major Millions, Immortal Romance, Thunderstruck, Game of Thrones, Leagues of Fortune, Break da Bank. They all come with unique features such as wilds, scatters, bonus rounds and free spins.


This is one of the smaller but very innovative online slot game developers with offices based in Sweden and Malta. They release some truly excellent online slots that are worth checking out and playing. Some of our favourites from Thunderkick include Sword of Khans, Carnival Queen, Rocket Fellas and Flame Busters.

Nolimit City

This developer is best known for its highly volatile gameplay, extreme variance, huge possible payouts and complex math model online slots featuring some of the most advanced slot bonus features and attractive designs. You'll find several top casino slot sites where you can play their online slot machines on this page. Some of the legendary games they've released are Deadwood, Tombstone, San Quentin, Punk Rocker, Mental.

Play'n GO 

You can certainly find this developer on all of the best online slots sites, including CasinoFriday, N1 Casino and Bitstarz. This slot game developer is best known for making slick, top quality online slots, and they're constantly releasing new games that are worth checking out (Gemmix 2, Hugo Carts, ZZ Top Roadside). Some of the top Play'n GO slots are Book of Dead, Reactoonz, Sweet Alchemy, Moon Princess, Pimped, Cloud Quest and more.

Big Time Gaming 

We all know the slot Bonanza! This Australian based slot developer was the first to introduce Megaway Slots™. Some of the BTG slots we like are Lil Devil, Opal Fruits, The Final Countdown, Who wants to Be a Millionaire. You can try their games on the best online slot sites listed above.

Scientific Games

Las Vegas-based Scientific Games Corporation is recognized as a global leader in providing casino systems, lottery and online gambling software across the globe. Scientific Games was founded back in 1973, and it has constantly been developing new products for land-based casinos and online casinos since then. 

Blueprint Gaming

Blueprint Gaming is considered the best UK online slots developer established in 2001 and has since become one of the leading suppliers of real money slots online. Blueprint Gaming's portfolio includes classic, megaways and branded slots featuring some of TV's most famous characters such as Rick and Morty™ and Ted™. You can find any of their games visiting the best online casinos in Ireland, UK, and most land-based gambling establishments.

Yggdrasil Gaming

Yggdrasil was founded by Fredrik Elmqvist, a former executive of NetEntertainment, in 2013. They are the best known for Vikings Go To Hell, Orient Express, Nirvana, Valley Of The Gods, Golden Fish Tank and Cazino Zeppelin. The provider is dedicated to creating fun, engaging and high-quality games across Europe as well as online gambling establishments all over the world.

Online Slots Knowledge

The Online Slots Knowledge Base

If you're planning to play these top slots for real money, it's always a smart move to get acquainted with the online slot machine scene before making your first deposit at an online slot site. That way, you'll have a better idea of how they work, what to expect from these slots games, and your chances to win. For example, if you plan to play a high variance slot, you might need to learn more about RTP percentages and volatility levels. This advice is especially true if you're a newcomer to online gambling. Since it will take you far less time to figure out both what you like and, even more importantly – what is not your cup of tea, thus allowing you to focus only on playing the types of slots that suit your needs and preferences. Below, we'll give you a quick rundown of some of the most essential facts and details about online slots so that you're ready for real money play.

Try Slots for Fun (Free) Before Playing for Real

Most of the European slot sites will let you play free slots without downloading or registering. All you need to do is pick a slot game you like and use fun credits to play. Thus, you will learn the game rules, become familiar with the pay tables and the game mechanics, as well as get an idea of what to expect when you decide to play slots for real money.


Bear in mind; however, any wins in the free play are not real money. Should you wish to play slots for real cash funds, you must go through a registration procedure at an online casino and make a deposit. The best slot sites always provide their customers with a large variety of payment methods, including debit/credit cards, e-wallets, prepaid cards, cryptocurrency, bank transfers and others, so you should have no problems making a deposit.

Best Paying Slots: Finding the Right Game for You

An excellent guide to finding the best paying slots is the RTP or return to the player. This is a statistical number on how much a game will pay back over a large sample of spins. Simulations for certification purposes are usually done over billions of spins to determine the average return.


Generally, the higher the RTP percentage, the more the slot will return to you! Obviously, it can never be 100% as a house edge is built-in to all online slots providing the revenue for the casino operators and game providers.


Therefore always look for slots with high RTP’s and avoid those with low to get the most bang for your buck. For example, NetEnt slots feature an RTP between 93 – 98 per cent, while Microgaming slots run in the range between 88 – 98%. And the lowest RTP is standard among progressive jackpot games as an additional percentage is reserved for the jackpot.

The Difference Between Low Volatility and High Volatility Slots

It is common nowadays for game providers to state the RTP of their games. Still, few are actually disclosing more factual information, such as the volatility. You might ask yourself now what volatility is? In basic terms, it is a measure of how wins are distributed over a large sample of spins on a particular slot. 


A low volatility slot, in general, will provide you with more extended playtime with small wins, while high volatility slots offer less playtime but with more significant big-win potential.


The best way to determine slot volatility is by going through its paytable. If the payout difference between hitting two and five top symbols is significant–it is likely a high-volatility slot. The opposite applies to low volatility slot games. The example below shows one instance of each.

Top High Variance Slots
High Variance Slots Developer Max Win
San Quentin Xways Nolimit City 150,000x
Dead or Alive 2 NetEnt 111,111x
CherryPop™ Avatar UX 56386x
Lil’ Devil BTG 100,000x
Money Train 2 Relax Gaming 50,000x
Top Low Variance Slots
Low Variance Slots Developer Max Win
1429 Uncharted Seas Thunderkick x
Bloodsuckers NetEnt x
Esqueleto Explosivo Thunderkick x
Simsalabim NetEnt x
Viking Runecraft Play’n Go x

The Best Way to Win at Online Slots

If anyone ever tries to convince you that they can give you the best strategy to play slots, you would be well-advised to avoid these people. It simply does not exist. Online slots are games of chance, where pure luck determines the outcome. Hence, when playing slots, you should not worry about how to win but how not to lose your balance.


#1. The best we can do is set a budget that we want to spend and adjust the bet size to a number that will give us the playtime we are looking for and play at a risk level we feel comfortable with. If you’ve made some good wins that elevate your balance, you can try increasing your bets; this way, you don’t lose your initial deposit but a portion of your winnings. Remember to start reducing it again if it fails to produce another good win.


#2. The other tip we experienced players can give is to avoid staying too long on the same slot. We all have our favourites! But we usually have the “false” feeling that we know how the slot behaves, and that big win could be just around to corner. 


#3. If you feel that the slot is “cold”, try a different one and change it again if it gives you the same poor feeling. Simply avoid “hammering” the same slot in the belief that it has to provide you with the big payout at a certain point.

Bankroll Management When Playing Online Slots

The Golden Rule: determine your budget for the session or even a single game, and under no circumstances go beyond it. Decide how much money you can afford to lose and also decide how much you would need to hit the cashout button. Whatever the results are – end the game session! Here are the reasons why:


 #1. When you get a big win, your natural instinct would be to continue betting larger and larger amounts to get that one really huge win.


#2. If you lose a significant amount of money, your instinct would be to continue playing to get it back as soon as possible through additional bets.


Both losses and wins can impair your judgement. The desire to win losses back or the euphoria after a big win can easily lead to even bigger losses!

Online Slots to Avoid

After more than two decades of internet existence, we all know that anything connected with money will attract fakers. It is not different with online slots and games. 


All licensed slot games are hosted on dedicated servers of the game provider. Luckily, there is a simple way to determine whether you are looking at an original or a fake online slot. And that no matter if you play in demo or real money mode. Simply open a game in demo mode and follow the steps below:


Right-click on the game window and select “Inspect”

Once an additional screen appears, choose “Network”


Now you should see the server address from which the game loads. 


Each game developer has its own server, and by knowing its name, you can tell whether the one you see is legitimate or not. 

Slot Providers' Server Address
Game Provider Genuine Servers
Play'n GO
ELK Studios AB

Note! If many slots of different game providers are connected to one server, generally, it is 100% fake!

Frequently Asked Questions About Online Slots

Online slots that you enjoy the most will always be the best.

Yes. Most of the online casinos listed on this page offer players the opportunity to try their best online slots for free without requiring registration, however, availability may depend on your country of residence.

Online slots can be played via your mobile device or desktop computer at any time, however, on mobile, there are fewer slots to chose from.

Generally, they are mid or low variance slots, however, for more details, you can check out our slots guide above on how to find the best paying slots.

In one short and clear word, no. You could ask any player who has been spinning on slots for some time, and they would be able to tell you a conspiracy theory, a dubious spin sequence or chain of events in their session or what they consider clear proof of games being rigged. We call that wearing a tinfoil hat in the player community. Because most if not all that we experience is subjective and not based on data or large enough samples.


Here is an example of a 2019 slot with medium volatility where the developer ran simulations exceeding 200 billion spins before certification:

  • Big Wins: 15x – 1 in 84
  • Super Big Wins: 40x – 1 in 189
  • Mega Wins: 70x – 1 in 444
  • Epic Wins: 100x – 1 in 997


This is done to collect large enough samples that will supply reliable average data on how a math model of a slot will perform in the long run and make sure the game achieves the advertised RTP (return to player).


Here you can also see the distribution of larger wins on the slot and their frequency. That, however, does not mean that you will hit them at those intervals. Modern online casino slots are built on complex mathematical models. An RNG (random number generator) result is called up to determine your spin result for each spin. You could go thousands of spins without hitting a super or mega win. Even more when it comes to an epic win. Or you could hit them all in consecutive spins if Lady Luck is on your side.


Online slot games should be seen as a form of entertainment that will cost you money. Therefore, you must determine the maximum amount you are willing to spend and never cross that line. Equally important is setting a win limit to get up and walk away instead of squandering it back. You have to remember that you cannot always win, that the house always has an edge and that you can never predict what will happen in a game. If it hasn’t been made clear before, sensible bankroll management really is one of the most important things when playing online slots.

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