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Best Online Slots and Slot Sites 2021

Naming the best online slot providers would look like a natural thing compared to naming the best online slots. Nevertheless, based on our experience and information we gathered from the top casino forums, the 10 slots listed below are among the most popular across all online casino in Europe and beyond:

Slot Name Slot Provider Slot 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! Begambleaware.

Here’s a tip: New players are always advised to try the best online slots for free before wagering their real money. Most of the slot sites listed on this page will let you try them for free without downloading or registering. All you have to do is pick a slot game you like and use fun credits to play. By doing so you will learn the game rules, get familiar with the pay tables and the mechanics of the slot, as well as get a sense of how it would perform when playing for real money.


Any wins in the free play are not real money. Should you wish to play these top slots for real money, you will need to go through a registration procedure at an online casino and make a deposit. Best slot sites accept payments with a large variety of methods such as debit/credit cards, e-wallets, prepaid cards, cryptocurrency, bank transfer and others.

Best Slots Online

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 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.

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 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. 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.

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. 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.

Dead or Alive 2 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.

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 most popular online slots among both new and experienced players 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%.

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. The 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 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.

Casino Sites Offering the Best Online Slots

The following page section includes some of the best EU online casinos offering over 1,000 top casino slots, fast withdrawals, and complete security so you can play all of the best online slots listed above safely, and without worry.

Guide and Tips for Choosing and Playing Online Slots

In the following section, you’ll find some tips on how to choose and play online slots. By understanding what are the best slots to play, how to find the best slots, and play them, you’ll be able to decide which slots are right for you.

Slots are by far the most played game of chance at online casinos. They stand out with their simplicity of choosing a bet size, pressing the spin button and hoping for a lucky moment. Still, there has always been the question of whether winning continuously on slot machines is possible or just a myth game providers and casinos are promoting.


➱ We believe that a mere 1% of players at online casinos win large sums of money, the rest just sometimes manage to make a small profit.


Despite countless stories and so-called guides about winning strategies on slots, there is simply said none that would guarantee you a win. Online slots are games of chance, where pure luck will determine the outcome. Hence, when playing slots, you should not worry about how to win but how not to lose your balance.


In general, online slot games should be seen as a form of entertainment that will cost you money. Therefore, it is crucial that you determine the maximum amount you are willing to spend and never cross that line. Equally important is setting a win limit where you get up and walk away instead of squandering it back. You have to remember that you cannot always win.

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 slot that will be the revenue for the casino operators and game providers.


So, to find the best-paying slots, always look for slots with high RTP’s and avoid those with low RTP’s 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%. However, the lowest value is common to progressive jackpot slots as an additional percentage is reserved for them.

If anyone will ever try to convince you that they can give you the best strategy to play slots… hmm. Start running for the hills! It simply does not exist.


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 for some time. In this case, 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.


The other tip we as experienced players can give you 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. 


Should you get the sensation that the slot doesn’t run well, change and try a different one, and change it again if that one gives you the same poor feeling. Simply avoid “hammering” a slot in the belief that it has to give you the big payout at some point.

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! 


 It is often hard to stop when you are winning because you might think that this is your super lucky day or when you lose big, for that matter. 


  Should you have incurred a loss, exit the casino, relax and keep busy with something else to take your attention off the fact that you lost money. Never try to win back your losses! It is better to come back another day with a clear head and try your luck again.


  Always remember that online gambling should be fun and entertaining, which at the end of the day will cost you money like anything else in your life. Therefore, sensible bankroll management will avoid overspending and possibly using funds that you shouldn’t. 


  The size of your gaming budget should always reflect on what you can comfortably afford to lose. And best is to determine in advance specific limits, regardless of the outcome of your gaming session. 


  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.

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 of a slot. 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 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 large, you will likely play a high-volatility slot. The opposite applies to low volatility slot games. The example below shows one instance of each.Example of a high volatility slot

A slot tournament is a popular type of entertainment at an online slot site that allows players to compete against their fellow slotters to win extra prizes or bonuses for reaching the top of the leaderboard. Casino operators realized that the tournament added a competitive edge to player experience that led to the development of various competitions and races being available today. They are named Battle of Slots, Clash of Spins, Reel Races, Rizk Races, Reel Thrill, Champions Races, Slot Wars and other names.

Happy Tournament Winner

Recently, casinos and some of the best slot providers have joined in and organized networkwide tourney where players can compete against thousands of others for usually much larger prize pools. The competitions run usually 24/7 and last from just 15 minutes to an entire month. 


The rules are usually 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


Most races and tournaments are free to enter, and prizes are either cash, bonuses or extra 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 in free races.


If you wish to compete against other slot players, here are some of the most popular online casinos in Europe that offer this kind of tournaments for everyone:


  • Bitstarz
  • N1 Casino
  • Fun Casino
  • Casumo

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. 


Luckily, there is a simple way to determine whether you are looking at an original or a fake online slot. All licensed slot games are hosted on dedicated servers of the game provider. 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. 

Following is a list of gambling servers used by genuine slot providers:


  • NetEnt: casinomodule.com
  • Microgaming: gameassists.co.uk or also quickfire.gcontent.eu
  • Quickspin: cloudfront.net or also gamassists.co.uk If in an online casino are not many “Quickspin slots” then, they can be connected to the Quickfire server. In this case, it must be gameassists.co.uk.
  • Endorphina: endorphina.com
  • iSoftbet: static-games.isoftbet.com
  • Novomatic: greentube.com
  • Amatic: amatic.com or also amatic2.softswiss.com
  • Thunderkick: thunderkick.com
  • Betsoft: betsoftgaming.com
  • Yggdrasil Gaming: yggdrassilgaming.com
  • NextGen: cloudfront.net or also nyxmalta.com
  • ELK: contentmedia.eu
  • EGT: egtmgs.com
  • Play’n GO: playngonetwork.com
  • GameArt: game-program.com
  • Habanero: insvr.com

➱ If many slots of different game providers are connected to one server, and this server isn’t an official one for any of the providers, it is 100% fake!

Best Online Slot Providers to Choose

Did you know that over 250 slot game developers and game studios are currently active just for online slots? And this number does not include the subcontractors and freelancers. Hence, picking the best out is something like finding the needle in a haystack.


Nevertheless, we have access to statistical data and our own experience, which allows us to determine which slot providers are among the top players’ favourites:

Provider's Name Description
Thunderkick Thunderkick is an independent online casino game manufacturer that specializes only in slot games. Beat the Beast, Pink Elephants, and Flame Busters are among best known of their slots.
Big Time Gaming Top magaways slot provider based in Australia, best known for Bonanza, Lil Devil, Opal Fruits and The Final Countdown.
Novomatic The leading gaming technology group in Europe. Best known for Lucky Lady's Charm, Book of Dead, Dolphin's Pearl and Captain Venture slots.
Endorphina Pupular slot provider in Europe. Best known for Minotaurus, Voodoo, Satoshis Secret.
Blueprint Gaming The best slot game provider based in the UK, well-known for Genie Jackpots, The Pig Wizard and Return of Kong.
Yggdrasil Gaming Best known for Vikings Go To Hell, Orient Express, Nirvana, Valley Of The Gods, Golden Fish Tank and Cazino Zeppelin.
Microgaming Well-known for Immortal Romance, Thunderstruck, Game of Thrones, Leagues of Fortune, Break da Bank.
Play'n GO A leading online slots provider know for Book of Dead, Pimped, 7 Sins, Reactoonz, Moon Princess, Gemix and Cloud Quest.
Scientific Games The world's largest gaming and lotteries company.
Nolimit City Best known for Deadwood, Punk Rocker, Toombstone.

Frequently Asked Questions

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 machines have a built-in casino edge (roughly 3 – 5%), which generates revenue for casino operators, game developers, and other entities involved in bringing a game to your screen.


As a result, playing slots will put you at a statistical disadvantage from the beginning.


There is no such thing as a “sure-win” when it comes to slots, which must be considered games of chance and not games of skill. You click the spin button, and depending on your luck, you will either lose or perhaps win big. It can all happen in one spin.

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