Online Slots at 21.co.uk

Here at 21.co.uk, we have a list of the most popular casino games in the UK that is fit to burst with over 400 different slots online for you to play. Whether you’re preparing to embark on an Egyptian-themed journey to the Valley of the Kings in the Book of Ra slot or taking your chances of winning to brand new heights with the Starburst slot, we have something to suit everyone in our repertoire - and it never stops growing. Every month we add brand new slots to our site. We work with some of the biggest developers in the industry, including the likes of Red Tiger, Blueprint Gaming and IGT, to bring our players nothing but the best new online slot games. Utilising the greatest leading online gaming technology we ensure our players always have an outstanding selection of slots to choose from.

Types of Slot Games

If you’re the type of online slot player who prefers the more traditional style slot games, we’ve got a great selection of classic titles for our players to enjoy. Slots such as the famed Action Bank and 7s Deluxe among others have you covered. There’s plenty of nostalgic gameplay to be had at 21.co.uk. But if you’re on the hunt for a more complex online slot, then that’s not a worry either! We have plenty of action-packed, bonus-led video slots too, from immersive storylines in titles such as Gonzo’s Quest and Centurion slot to brilliant bonus-filled ventures such as Wish Upon a Jackpot Megaways, you’re bound to find a top-class entertainment amongst the reels.

For our UK online slots players who are looking for a reel alternative to try out, we’ve recently introduced arguably one of the most innovative slot-inspired games in the business to our online casino collection - Slingo games. Slingo is a brilliant online bingo/slot game hybrid that brings you the best of both worlds by combining the rapid-fire gameplay of slots with the fantastically familiar number-board setup of online bingo as well as offering mega payout possibilities.

Everything You Need to Know About Online Slots

Slot Machines have rapidly evolved into one of the most popular types of best UK casino games in the UK, and the world, dominating the realm of both land-based and online gambling with their versatility and potential-packed gameplay. Online slots are the modern-day equivalent to the classic slot machines that were, and remain to be, extremely popular in bars, arcades and casinos worldwide. Introducing them to an online platform has made them more accessible than ever before! Access the best slots in the UK anytime and anywhere from the device of your choice, whether that be spinning through the Vegas classics on your mobile, finding free spins on your tablet or discovering new slots on your desktop. Your favourite fruit machine or online slot game is never more than a click away!

Slots Terminology

Name Description
3 Reel Slot Retro Style layout which includes three spinning reels
5 Reel Slot Modern Style layout which includes five spinning reels
All Ways Slots Slots that pay both left to right and right to left
AutoPlay A feature in online slots that allows players to spin reels automatically
Bet/Wager What players place on a casino game or bet to determine wins or losses
Bonus Round A special round in a slot machine that offers higher chances of winning
Branded Slots A slot that contains a unique theme, usually based around a TV show etc.
Casino Bonus The promotion that an online casino offers for new online players
Cascading Reels A feature where winning symbols are paid out then replaced by new symbols
Coin A currency in online casino games
Features Special aspects of gaming that make certain games unique
Fixed Paylines A select number of paylines that are guaranteed on each spin
Free Spins The most popular bonus round in online slots
Hit Frequency How often players are expected to land wins
Instant Win A type of slot that gives out wins quicker than standard games
Jackpot A feature in a slot machine that offers a gigantic win
Line Bet When a wager/bet is divided into bets per payline
Maximum Bet The highest total a player can stake on a single slot
Minimum Bet The smallest total a player can stake on a single slot
Multiplier A total in which players wins are multiplied by to make a final total
Nudge A bonus feature which moves slot reels up or down
Payline How many different ways players have to win on each slot
Payouts The money received for landing a winning combination
Progressive Jackpot A jackpot total that increases on how much the slot is played
Random Number Generator A coding mechanic that is used in all online slots
Return to Player The average return a player can expect from playing a game
Scatter Symbols Symbols which activate bonus rounds once landed
Spin The method of actually spinning the reels
Stacked Symbols Symbols which appear vertically to increase chances of winning
Stake/Total Bet All the money wagered on a bet
Video Slots Slots that contain video elements such as animations
Volatility The official rate of wins determined on average win and average win time
Wild Symbols Symbols that substitute for standard symbols

What Are Slot Games and How Do They Work?

Slot games are a type of gambling machine that feature several reels containing different symbols. The reels will spin to land on randomly generated combinations, some of which could see you receive some fantastic cash payouts. Each game has a determined number of paylines that players can land winning clusters of symbols across. Reels are a primary aspect of any slot. Every slot game online has its own reel structure and can feature anywhere between 3 or more reels for you to play with.

The more modern online slot games tend to feature more reels, huge numbers of paylines and bundles of bonuses. Expect to find features such as free spins, the option to gamble and huge multipliers. For an increased chance of winning, look to land bonus symbols across the reels such as Scatters, Wilds and more!

Interesting Fact

Did you know that the first slot machine was created in 1877, it was called ‘Liberty Bell’ and is currently on display as a historical artefact in the Liberty Belle Saloon, Reno, Nevada.

Examples of online slots you can play

As we mentioned earlier, here at 21.co.uk we play host to over 400 different online slots which come from leading developers in the online casino industry. You’ll find some of the best slot games in the world, such as the mystical Genie Jackpots slot and the adventure-themed Book of Dead slot. Or if you’re looking for something with more variety when it comes to the bonus feature on offer, check out some of the video-led slot games we have in our collection like The Goonies slot which has up to 13 fantastic features and modifiers for players to unlock. The brand new Wish Upon a Jackpot Megaways is another bonus packed slot for you to play online.

Maybe you want to stay loyal to more traditional, classic style slot games? Don’t worry, we have you covered on that front too. Titles such as Twin Spin and Reel King Mega, to name a couple, are ready to play.

What Are The Most Popular Online Slots in the UK

Whilst our modern titles hit big with many players here at 21.co.uk, there are plenty of classic slot games that will always hold a high degree of popularity within the online gaming community. Whether they have an extensive history as a land-based slot or have simply become highly revered by countless players over the years, each of the following online games has been referred to as being one of the best UK slots online available to play:

Cleopatra slot - Pay a visit to the Queen of the Nile, who could bestow some fantastic prizes to 21.co.uk players who enter her tomb. Standing as one of the longest existing slot games, this is a perfect place for new players to start.

Rainbow Riches - The rolling hills of the Emerald Isle could prove to be home to some golden payout potential, as the iconic Leprechaun could lead the way to that elusive pot of gold that lies at the end of the rainbow reels.

Eye of Horus - The Ancient Egyptian god Horus could appear to be a generous deity to 21.co.uk players who spin through the much-loved Eye of Horus slot, where wins of up to 500x your stake could be discovered.

Pixies of the Forest - Despite being a newer addition to our collection of slots, the mystical reels of Pixies of the Forest offer some potentially magical wins to be found across its 99 paylines. With a flurry of free spins and the use of the fantastic cascading reels feature, there’s plenty to discover in this fantasy-themed slot.

Interesting Fact

Did you know that the biggest slot machine in the world was named ‘Big Bertha’, standing at an impressive 2.5 meters high and 2 meters wide and it cost the equivalent of just under £950,000 of today’s Great British Pounds to make?

Slot Providers

21.co.uk has dozens of fantastic online slot providers, some of which have been around for decades and others that have been around for a small amount of time. Each of our providers are completely unique and have different focuses in regards to the games that they create. We’ve created blogs which will give you all the need to know information regarding our fantastic slot providers and these blogs can be found by clicking the links in the table below.

What Are The Most Popular Types of Slots at 21.co.uk

As online slots have evolved with the times, many different types of mobile slots have emerged onto the scene and some have seized a fantastic level of popularity amongst players here at 21.co.uk, offering up a variety of both modern features and nostalgic gameplay that panders to every preference:

Popular Online Slot Types: Megaways slot

Megaways slots are one of the most innovative types of modern slot machines we’ve introduced to our online casino collection, presenting players with up to a colossal 117,649 possible ways to land a win each time you spin the reels. Not only that - you can expect a bundle of bonus features waiting to be discovered. One of our favourite Megaways titles is the fabulous 88 Fortunes Megaways which transports players back to the luxe 88 Fortunes setting where Far East fortunes of up to 10,000x could be waiting.

Other notable mentions are Deal or No Deal Megaways, Fishin’ Frenzy Megaways and of course the legendary Rainbow Riches Megaways.

Popular Online Slot Types: Arcadic Fruit Machines

Following on from the popularity they formed in public houses and sea-side arcades, fruit-themed slot machines have become solid staples of both land-based and online casinos which makes them some of the most recognisable slot games regardless of whether you’re a slot newbie or veteran player. Adorned with arguably the most distinguishable symbols in the business, such as cherries, bells, 7s and bars, Arcade Fruit Machines stand as some of the most iconic and popular slots of all time - some of our favourites include the likes of 7s On Fire and Mystery Reels Megaways.

Popular Online Slot Types: Mobile Casino Slots

A number of online slots in the modern day are created for handheld devices such as mobiles and tablets. You can find out all the need to know information surrounding these slots by checking out our mobile casino slots. Why have providers started prioritising these players, we hear you ask? Well, 68% of 21.co.uk players in 2020 played on a mobile device and over 17% of our players have played a game of Roulette on mobile. That means just 32% of sessions are not played on a mobile device, so if a game isn’t suitable and up-to-date for mobile players, providers miss out on up to 68% of their potential revenue for the game. 65% of Mobile players also return to play the same game multiple times, meaning that if a slot leaves a good first impression, mobile players are statistically likely to return to the game.

Popular Online Slot Types: Cluster Win Slots

Cluster slots have become one of the latest crazes to take over the online slots world with titles such as the intergalactic Reactoonz and fruity Jammin’ Jars. Similar to regular online slots, the idea is to match as many symbols as possible. Often in cluster slots, there’s a lot of symbols on the reels and gaining as many as you can together in a “cluster” often leads to bigger wins. They also take an aspect of cascading slots because as symbols are matched and disappear, more symbols fall in, giving you another chance to get even more cluster wins.

Popular Online Slot Types: Cascading Reel Slots

Cascading Reels slots (also known as Tumbling Reels) offer up another extremely innovative, modern feature that boosts the payout potential of online slot games significantly. Land multiple wins from a single spin, as each time a winning cluster is formed, the Cascading Reels feature works to remove all of the symbols involved in the win and allows fresh symbols to fall into their place. This will continue to occur until no more winning combinations can be made. We have numerous slots that include the Cascading Reels feature, with some of the most popular being Bonanza Megaways and Monopoly Megaways.

Popular Online Slot Types: Jackpot Slots

Jackpot prizes are a welcome addition to any slot game, which is why we provide an incredible range of epic Jackpot Slots at 21.co.uk. Blueprint brings you a range of progressive prizes from Genie Jackpots to Winstar. Many of their slots feature the Jackpot King Progressive, which casino slot veterans are bound to have heard of. For those that haven't, the Jackpot King is a progressive jackpot in which 0.86% of each stake placed on the jackpot slot in play will be added to a progressive pot. The jackpot prize, therefore, increases with each spin of the reels, until it is randomly triggered. Once active, you'll spin the reels for golden crowns before making your way up the cash trail towards the Wheel King. Spin this wheel to see if you've won a huge multiplier or the Jackpot King itself. Looking for an online slot that's plugged into the promotional pot? Check out Top Cat slot, Slots 'O Gold or Fishin’ Frenzy Jackpot King just to name a few. Want to know about these exciting slots? We've put together an extensive guide answering one of casino players’ most asked questions, What is a Progressive Jackpot?

What New Online Slots Can I Play at 21.co.uk?

In April 2021, we had dozens of new online slots added to our library, including releases from Blueprint Gaming, Red Tiger and more, so if you’ve got one provider that is particularly your favourite, check out their newest game. We’ve narrowed down our fantastic slots to the three best of our releases and you can find them below.

East Coast Vs West Coast is a highly unique online slot by Nolimit City. The slot takes you into the battle that saw America implode during the ‘90s. East Coast Vs West Coast, what side are you on? Pick the winning side of this hip-hop battle that includes lowriders, boomboxes and graffiti. Will you change America forever?

What the Fox Megaways is a slot that may be nostalgic for fans of ‘Ylvis’ or generally anyone who listened to UK radio stations in 2013. However, Red Tiger’s slot doesn’t quite follow the same route as the song, as this fox sets out to take over Las Vegas by dominating the slot reels and becoming one with the casinos and embracing the atmosphere. It wouldn’t be a Vegas-themed slot without a large potential payout either, so if you’re looking for Jackpot standard wins, What the Fox Megaways could be what you’re looking for.

Fishin’ Frenzy Prize Lines is the latest creation from the brilliant minds at Blueprint Gaming, following on from their already successful Fishin’ Frenzy series. This game brings a unique style of gameplay to the franchise. If you’re familiar with Slingo slot games, then you’ll be aware of what we mean here as the style of the game is very similar. If you’re wishing to stick to a regular style of slot, then this game might not be for you, but if you’re open to something new, we advise trying out this slot.

Can I Play Slot Games on Mobile?

Want to play your favourite slots on the move? At 21.co.uk, you can. Our slots are mobile and available to play on desktop, mobile or tablet. All of our mobile slots are fully optimised, ready to play in top HD quality, no matter what size screen you're playing on. You can play from the comfort of your own home or on the go whenever suits you best without sacrificing any of the top-notch 21.co.uk quality. You can play mobile slots via the 21.co.uk Casino App on iOS or Android. If you’d prefer to continue playing through the website on your mobile device that’s also possible. Just head over to www.21.co.uk where you’ll find the entire site and all our slots are designed to work exactly as expected on your mobile device.

Can I Play Real Money Slot Games on The 21.co.uk App?

Yes! We are a real money casino. Just set up your account, deposit and play. On the other hand, you’ll also find a range of free play demos with our online slots allowing you to test your next online slot of choice before you play. Free play allows you to learn the ropes, to get a feel for the slot before you actually stake any cash. Don’t forget to take advantage of any promotions we offer to get the most out of your deposits.

UK Online Slots F. A. Q.

Where can I play online slots?

You can play over 400 different UK slots online right here at 21.co.uk. Our selection is brimming with a variety of different themes, features and payout potential for you to discover each time you play. Take a look at our feature games tab, the slots found on the homepage, or use the search tool to find the slots you’re looking to play. All of our online slots are also optimised and available to play across all mobile, tablet and desktop devices, so you can play your favourite games wherever suits you best. Plus, when you become a fully-fledged 21.co.uk player, we offer up a frequent flurry of casino bonus offers for you to play with - from a £10 free no deposit bonus to free spins on selected slot games, there’s plenty to keep an eye out for.

What is the difference between online slots and fruit machines?

Despite many players assuming they’re the same, there are actually multiple notable differences between online slots and traditional fruit machines. Whilst it’s not fully untrue that fruit machines and online slot games share similarities, the reality is that they are simply just one of many variations of slot machines available both in online and offline casino environments. Online slots usually offer a varied number of paylines, reels and theme-fitting symbols that players can use to land some potentially valuable wins. Fruit machines tend to have 3 reels (4 or 5 reels on occasion) and only a single payline for players to land winning combinations across - they usually offer a much smaller payout potential. That doesn’t mean fruit machines can’t be valuable as there are still big wins to be had. In the modern age of slots, fruit style machines are becoming increasingly complex like their counterparts, to add additional bonuses and ways to win.

Can I trick a slot game?

The short answer is no. Despite plenty of speculation, slots are completely random and run on randomly generated outcomes so there is no way to trick slots online into giving you a guaranteed win. Each spin is individual to the last, meaning any player can win, or lose, on any spin despite the previous outcome. Does that mean you can win 3 times in a row? Yes, but you can also lose just as many times.

How do I win playing online slots?

Different slots have different ways to win. Generally, to score a win when playing online slots, all you have to do is land a winning combination of symbols across a payline. The number of and shapes of paylines can vary. Keep an eye on wild symbols appearing as they can help increase your winning potential.

What traditional slot machines are on 21.co.uk

Here at 21.co.uk, we’ve inducted several different traditional slot machines over the years, in an attempt to help bridge that gap for players who are used to playing land-based slot games but looking to make a move over to the world of online slots. It also allows us to provide slots suitable to those of you who fancy a little bit of nostalgic gameplay from time to time. Some of our favourite titles include:

Fishin’ Frenzy - Every angler’s favourite slot game, cast your lines and see if you can reel in yourself a win of up to 2000x your stake across one of the game’s 10 available paylines.

Lucky Lady’s Charm - One of Novomatic’s most popular slots and it’s easy to see why. It offers up a fantastic combination of sleek, easy-to-navigate graphics and phenomenal payout potential of up to 900x your stake, making it a great all-rounder for both newbies and veterans alike. There’s also a popular sequel now available in the form of Lucky Lady’s Charm Deluxe 10.

Heidi’s Bier Haus - Get ready for an Oktoberfest like no other as Heidi opens the doors to her bier haus, where players can merrily spin to uncover some fantastic Germanic winning potential.

Other than Slots what can I play on 21.co.uk?

Accompanying our colossal collection of the online slots in the UK, we also host one of the best live casino arsenals in the business. We work with some of the biggest developing powerhouses to deliver our players the absolute best in online blackjack, online roulette, poker and more. All of which are up and running 24/7 so you can enjoy every element of playing live table games from the comfort of your own surroundings whenever you’re ready to play. If you don't know your blackjack side bets from your roulette bets visit our blog for more articles and guides.

Joining our catalogue alongside some of the more classic games are also a bounty of live game shows, including the player-favourite Live Dream Catcher, the fantastic re-imagining of the nostalgic board game Monopoly Live and, more recently, the bonkers bonus bonanza that is Crazy Time - where players have 4 different arcade-style mini-games to discover that could pave the way to wild wins of up to 20,000x your stake!

Are Table Games Different To Real Money Slots?

Although both slots and table games are based on luck, gameplay differs. Slots are based on random number generation and no strategy to help win can be used in the same way you can in casino table games. You can Learn Blackjack Strategies which will impact how you play the game. Another way these types of games relate is being simulated. Some tables are completely virtual, like slots, while others are played live. Virtual games are great if you’re looking for a laid back approach to playing. Keen to try something other than slots? Lightning Roulette is one title that brings extra bonuses to a well-established game. To play virtual, try something like Blackjack Perfect Pairs.

Play slots and bet on sports together

Did you know that we offer more than just world-class casino games here at 21.co.uk? We also have one of the top online betting sportsbooks. It’s brimming with the latest odds and best betting tips from our in-house tipsters for all of the biggest sports you can think of. Whether you’re a Horse Racing boffin, a Football Betting buff or you’re more partial to Rugby Union Betting or Rugby League Betting, you’ll find every odd, tip and treble you need right here. If you miss your pre-match bet don’t panic. You can Bet Live In-Play once the game has begun for a range of sports.