The casino world is packed full of online slots. They are easy to play, entertaining, and if you’re fortunate, you could win cash! The best slots such as Starburst, Gonzo’s Quest and Immortal Romance are available to play at the best slots sites UK like Mr.Play, Genesis Casino and Plaza Royale.
With our guide you will learn which are the best slots to play in the UK, and where you can play them. Learn about RTPs, the different types of slots available, plus the best welcome deals and bonus spins offers. Load up your casino account with £££s and get spinning those reels!
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We’ve now told who we think to be the best slots UK providers for slots sites, but how do we know what we are talking about? What do we look for when reviewing a slots site? What do we think makes a slot site or the best bingo sites with slots worthy of a high place on our list? Whichare better, and which is best?
You’ll find below the aspects of an online slots site that we pay close attention to when assessing which slots sites are the best.
ALL online casinos have slots. They are easy for the sites to obtain, as most slots providers are covered by aggregators like EveryMatrix who provide the best slots to play online from multiple software companies. A new online casino only has to sign a single deal with an aggregator and blam … lots and lots of the best slots UK sites have to offer.
However, quantity and quality are – as you will kn0w – very different things. So, we look for a decent number of quality slots – slots from providers such as NetEnt, Microgaming, Playtech, Play’n GO and Pragmatic Play. We look out for titles that we know and love like Gonzo’s Quest, Starburst and Immortal Romance.
The greater the number of quality online slots a site has, the higher it is placed on our list of the best – it really is as simple as that. Our number one – mr.play (one of the best payout slots sites) – has 350+ excellent slots including Starburst, plus other classics like Twin $pin and Big Bass Bonanza.
The casino world does not just revolve around slots, even though at times that might seem to be the case. We prefer online slots sites that present casino-playing opportunities too, as not everyone wants to spend all their time at an online slots site spinning the reels.
So, blackjack and roulette are a bare minimum at the best sites, plus baccarat, video poker and casino poker. Dice games such as sic bo are a nice addition too but if a site does not have online scratch cards, we can’t say we’d be too bothered. Virtual sports are another ‘nice to have’ but we do think its better to bet ‘properly’ at online uk betting sites. You might also want to review the best betting sites for slots.
The live casino boom in the UK is something that has really taken off since around 2017, so we give preference to the best sites for slots that have invested in a live casino with plenty of available tables offering blackjack, roulette, baccarat and more. PlazaRoyal is one of the best sites with live casino games, plus plenty of software-based ones too.
It doesn’t take much for an online casino to offer a welcome bonus. While online casinos are not outright trying to bamboozle you (well, not all of them), a lot offer cash-laden bonuses but use wagering conditions to make sure you’ve only a very slim chance of emerging from your wagering with any bonus money remaining, which you can then withdrawn.
That’s why we champion the best online slots sites UK that offer genuine promotions with decent wagering conditions, such as the Grosvenor Casino. Their bonus is not the biggest, but their wagering terms do give you a very good chance of having cash left once your wagering is done. It is possible to make money from a bonus (we have done it ourselves a few times) and we prefer sites that give you a decent chance of doing just that.
If you’re a bit long in the tooth at online slot sites, then you’ll know that the UKGC banned the use of credit cards at gambling sites in 2020. They are also thinking of banning eWallets, as eWallets can be linked to credit cards. This will severely thin the number of options for payments for UK customers.
Therefore, we give priority to the best sites for slots that already have a wide range of payment options available. Visa and MasterCard debits cards are a given, of course, plus popular eWallets (Skrill, PayPal, Neteller), eVouchers (Paysafecard), bank transfer facilitators (Trustly) and even cryptocurrencies.
Sloty is a good example of one of the best payout slots sites for slots with a number of payment options.
It’s very, very obvious that slots are very, very popular. As we have already mentioned, if you head to any online casino then the chances are that the number of slots available with easily outnumber the total number of non-slots games available and at a rate of ten-to-one.
So, why do people play online slots, and why should you?
Let’s face it, no matter what spin you put on it, blackjack is blackjack and roulette is roulette. Slots are a different matter, though. Although even the best slots to play share common themes, each slot is unique in some way or another. Whether they are ‘both ways pay’ slots like NetEnt’s Starburst or ‘avalanche reels’ slots such as Gonzo’s Quest, you’ll find something to truly enjoy about many of the best slots UK you like to play.
You actually win a lot when you’re playing online slots. Unfortunately, because of the way even the best online casino slots pay out your wins may not be greater then your stake. It could be said then that there are two types of ‘win’ – a genuine win where you win more than your stake, or a win where you recover at least part of your stake. The idea of slots is to have more genuine wins than part-stake wins and non-winning spins! The best payout online slots UK are those with the best RTPs (see below).
NOTE: In 2021 the UKGC made it illegal for slots to announce wins that are lower than your stake as a ‘win’. Slots often pay out low amounts for common symbol payline wins, so you need to be aware of this.
Playing on some of the best online casino slots is similar to buying a lottery ticket. You don’t just buy a lottery ticket hoping that you’ll win the jackpot – you also buy one hoping that you could win one of the smaller prizes on offer.
Progressive jackpot slots such as two of the best Microgaming slots – Mega Moolah and Major Millions – do work in the same way as lottery tickets, in that there’s usually a mega prize attached but loads of little ones too. Progressive jackpot slots do tend to pay out less frequently than lotteries though – one real world slot in Las Vegas called ‘Lion’s Share’ once failed to pay out its progressive jackpot for over two decades! The best payout online slots are never that slow to payout, thankfully.
The number one reason you should be playing the best slots is because they are entertaining! You don’t have to worry about betting systems, or counting up to twenty-one, or knowing poker hands if you play an online slots game – you just spin the reels and hope that good fortunes smiles upon you!
If you are playing the best online casino slots and not being entertained (maybe you are trying to win back earlier losses, or you find you can’t stop playing them even if you want to) then you should stop playing them.
You may wonder why there are so many online slots – thousands in fact – at the best UK online slots sites or the best betting sites for slots. Are all online slots the same? Well, of course there are a lot of similarities across the slotting board, but every slot produced some kind of unique factor, even if it just the artwork. There’s always the chance that a software company will release a complete ground-breaker, like NetEnt did with Gonzo’s Quest, or Big Time Gaming with Bonanza Megaways.
The best slots to play online can perhaps be broken down into five catergories, and here is a brief description of each of the most common type.
Classic Slots are software versions of slots – or rather one-armed bandits – that have been familiar to UK players for decades. They typically have three reels and just one payline, right across the middle. They work no differently to the types of slot found in pubs, clubs and in amusement arcades, although they are slowly being superceded by video slots at the best UK online slots sites. Many software companies (for example Play’n GO) still release the odd three-reel slot now and again.
Video Slots have been around since the late 1970s, when they first appeared in Las Vegas using the same tech as video poker machines. They usually have a minimum of five reels, multiple paylines (the slot pictured, Starburst, has twenty) and bonus aspects such as wilds, scatters, side games and special features. Video slots are by far the most numerous slot type found at online casinos today, with twenty or so new titles being released each and every week.
Progressive Jackpot Slots actually pre-date the internet. Real-world slot machines were linked together across multiple sites. A small proportion of each player’s stake was held back to create a rollover jackpot that built over time. A rare combination of symbols on any of the linked slots would trigger the jackpot, making someone very happy indeed. Software slots with progressive jackpots work in the same way, although of course they are linked over the internet. MegaMoolah (pictured) holds the record for the highest-ever progressive jackpot win at £19,429,358. Progressive jackpot slots are the best payout online slots UK available in terms of jackpots.
Avalanche Slots or Cascading Reels slots took off in 2015 with the ground-breaking (literally) release of Gonzo’s Quest (pictured) by NetEnt. This was a real slot with a difference, as the reels were replaced by falling stone blocks that would tumble into place. The (then) new concept was that any blocks which formed part of a win would explode, allowing new blocks to fall down and replace them. This action could of course trigger new wins, and the ‘tumbling’ could continue. This ‘avalanche’ or ‘cascading’ mechanic has now been used dozens of times by other slots providers.
All Ways Pay slots are slots that do not have paylines. In order to land a win, all a reel-spinner has to do is land identical symbols in sequence across the reels. The row each symbol lands on is immaterial – as long as they are consecutive they score a win. 5×3 slots that are ‘all ways pay’ have 243 ‘paylines’, like one of the best Microgaming slots Immortal Romance. 5×4 slots have 1,024 ‘paylines’, and 6×4 slots have 4,096 ‘paylines’.
Megaways Slots began to take the online casino world by storm in 2019. The concept was invented by Big Time Gaming for their slot Bonanza in 2016, and has now been leased out to other companies who apply the Megaways concept to their own slots. Megaways slots typically have six reels and a random number of symbols on each reel from between two and seven. As this is an ‘all ways pay’ slot the number of potential paylines maxes out at 117,649!
Theed Slots or Franchise Slots are slots developed by software companies with a common theme. Often – like Playtech’s now defunct series of Marvel-based slots – there’s a linked progressive jackpot involved. In others you can earn bonuses in one linked slot and then use them in another, just like with Playtech’s Kingdoms Rise. Playtech as considered the king of themed or franchise slots, with Age of the Gods perhaps now being their most popular.
Cluster Pays slots are not – for some – considered to be slots. They usually have much bigger playing areas than normal slots, where symbols fall into place rather than rolling reels. You score wins by landing a cluster of identical symbols. A cluster is a set of symbols that touch each other either vertically or horizontally (not diagonally). The bigger the cluster – the bigger the win! Cluster Pays also usually use the avalanche features, so successive cluster wins are possible.
If you are new to playing the best online slots, then just looking at them can be puzzling enough. Most people in the UK think of slot machines having three reels and a single payline. Online slots are based on the kind of video slots that have been around in the US (and especially Las Vegas) since the late 1970s.
Here is your quick guide on how to play online slots, using NetEnt’s immensely popular slot Starburst – one of the best casino slots ever made – as an example.
As you can see Starburst has five reels. The number on either side indicates each of the ten paylines. Starburst is unusual as not only does it pay left-to-right like most slots, it also pays right-to-left, making – in effect – twenty paylines. At the moment, our ‘coin value’ is set to £0.20, and we are betting ten coins as there are ten paylines. The ‘level’ is the level that we are betting on. Basically, our total bet would be 10 x 1 x £0.20 = £2.00, as you can see on the bottom of the screen where it says ‘Bet: £2.00’. That’s a little too rich for us, so we are going to change a few things.
We have changed our coin size down to £0.01, which means our total bet size is £0.10, which is more acceptible to us than betting £2.00. It’s time to hit the spin button.
Whey-hey! The reels are spinning!
We didn’t win anything on our first, second or third spin, but we did on number four! We landed three ‘7s’ in a row on two paylines, line 9 and line 10. The number ’25’ tells us how many coins we have won for landing three 7s. As we won on two paylines we won 50 coins in total, and as our coin size is set to £0.01, that means we won £0.50! Happy days!
The best slots have wild symbols, or wilds. These substitute for any other symbol, aside from scatter symbols and special symbols that may trigger side games or jackpot wins.
Scatter symbols are symbols that can land anywhere to trigger a win or a special feature. They do not have to land on a payline, and the more scatters you land, the bigger the prize,
Sometimes when playing a slot that has this feature, winning symbols will freeze in place. This could be for one spin, or for a set number of spins, or until a spin where they are no longer involved in a new win.
These are symbols that freeze on the screen when involved in a win, but will move to a different position. They may do this for set number of spins, or until they have moved off the playing grid.
There are plenty of new slots sites and online casinos that pop up frequently. The market has not reached saturation point quite yet (and probably never will), giving slots players countless options for having somewhere to play slots.
Each new slots site comes with bonuses of course, which you can easily take advantage of. New sites may also offer ‘exclusive’ slots unavailable elsewhere, or may just have a new and vibrant approach that’s completely different from what you’re usually accustomed to.
Here are five of the best new slots sites in the UK that you might want to take a look at.
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If you are brand spanking new to the best online slots then you’ll swiftly realise that you are entering a slotting minefield. There are just … so … many. So many in fact that by now people have lost count – it’s somewhere between 5,000 and 10,000. How are you supposed to know which slots are good to play? What if the first slot you try is a clunker and it puts you off playing slots for life?
Never fear! We are here to pick out a dozen of the very best UK slots that have ever been created. We are so ace that we are going to tell you where you can play them too!
Play at mr.play
Gonzo’s Quest (NetEnt)
Play at Plaza Royale
Immortal Romance (Microgaming)
Play at Genesis Casino
Mega Moolah (Microgaming)
Play at Mansion Casino
Morgana Megaways (iSoftBet)
Play at CasiPlay
Fluffy Favourties (Eyecon)
Play at QueenPlay
Aloha! Cluster Pays (NetEnt)
Play at Grosvenor Casino
Rich Wilde & the Book of Dead (Play’n GO)
Play at Sloty
Jammin’ Jars (PushGaming)
Play at Casumo
Blood Suckers II (NetEnt)
Play at 888casino
Money Train 2 (Relax Gaming)
Play at LeoVegas
Bonanza MegaPays (Big Time Gaming)
Play at Unibet Casino
There are none. If you are in the United Kingdom then you can no longer play the best online slots UK for free. The UKGC made this previously popular aspect of online slots illegal in 2019. Before that you were able to play the best free slots for ‘play money’, but not anymore. The best online slots real money cannot be played for free.
The ‘buy feature’ options on some slots are banned in the UK too – this enabled you to ‘buy’ the special bonus features of a slot such as a number of bonus spins or a side game for a set price as opposed to just waiting for them to appear on the reels.
In 2021 the UKGC announced yet more measures that would need to apply to online slots available at UKGC-licensed slots sites:
The UKGC also announced that October 31st would be the cut-off point for all these changes to be implemented.
It would take you a long time to count all the companies that now develop slots and other casino games for gambling websites. There are well over two hundred, which is probably double the number that existed a few years ago. Some companies, though, have better reputations than others. Below you will find details of who we feel are the best five online slots developers in 2021.
Welcome bonuses often involve bonus spins (spins of a slot that you do not have to pay for). You receive a number of bonus spins on a slot once you sign up for a new account. The spins may be restricted to one slot, or a few slots or you could use any slot at the site. Some of the best bonus slots include Starburst and Rich Wilde & the Book of Dead.
Your winnings from your free spins (or from the best deposit bonus slots sites offering a matched bonus, which is another common bonus offered at slots sites) are paid as bonus cash, and you need to go through wagering requirements before you can withdraw. Below you’ll find most of the important terms regarding bonuses and bonus spins explained as are common to the best bonus slots offers.
A slots site will match your deposit with the same amount of bonus cash if its a 100% bonus, so deposit £10 to get a £10 bonus. £10 for a 200% bonus with give you £20 in bonus cash, and £10 for a 50% bonus will give you a fiver. The best deposit bonus slots sites offer matched bonuses with decent terms and conditions.
The amount of wagering you need to do to turn your bonus cash into real money you can withdraw. An example could be 35 x bonus + deposit or 35 x bonus spins winnings. Say after using 100 bonus spins you won £20. To be able to withdraw that money, you would need to wager 35 x £20 = £700. Be aware – that’s the amount you need to wager, not spend. You could try 700 £1 spins on Starburst, for example. You would not lose every time, and indeed you could end up with more cash than you wagered once you have finished.
All games do not contribute equally to wagering, and some do not count at all. You need to check a site’s T&Cs before starting on your wagering. Say, for example, a site has a ten percent contribution for blackjack. If you need to play through £700 in wagering, and you play a £1 hand of blackjack, then only ten percent (£0.10) will contribute, so after that one hand you will still have £699.90 of wagering to go through.
Slots usually count 100 percent towards wagering, but some sites lower the contribution of slots with high RTPs.
Some online slots offers come with a winnings cap. No matter how much you win using your bonus spins, you cannot withdraw beyond that cap. This means that if a bonus spins offer has a cap of £5 and you win £6.70 via your bonus spins, then when it comes to withdrawing time £1.70 of those winnings will be forfeited. Naturally, it is always best to look for bonus spins offers that do not come with a winnings cap.
Below you’ll find some of the best slots sites UK with bonus spins offers.
If you want to get the most from your bonus cash, then you will be looking for the best UK slots sites or the best bingo sites with slots that have low wagering. Below you’ll find details of the wagering requirements at all our recommend sites.
RTP is an important measure of how frequently a slot is likely to pay out. RTP stands for ‘return to player’. The best RTP slots have an RTP between 95 and 97 percent. RTP is the amount of money – theoretically – that you would have remaining after a prolonged playing session. For example, say you had $100, and you played Big Time Gaming slot Bonanza, which has an RTP of 96%. After that hour, you should have $96 remaining.
Of course, as slots are highly volatile (they are prone to both winning streaks and losing streaks), this never happens in reality. RTPs are worked out by super computers playing millions of simulated spins. After your hour-long session with Bonanza you are as likely to have $146 as you are to have $46. RTP though is a good way of measuring a slot’s ‘pay-out’ rate, and it’s more beneficial to play slots with high RTPs than ones with low RTPs.
Here are ten of the best RTP slots which qualify as the best payout online slots in terms of return-to-player.
The majority of internet interaction since 2020 has been done via mobile devices. Slots players have been able to enjoy mobile slots since the creation of HTML5 in the mid-to-late 2010s. Prior to that, slots were created using Adobe Flash which presented an issue to iPhone and iPad users as Apple withdrew Flash support from their operating system in 2010, citing security flaws. Adobe itself effectively killed Flash completely in 2020.
Mobile slots work by temporarily downloading to your device as cached browser content when you want to play them. Because they are small files, downloading a game takes less than a couple of seconds (as long as you have a decent internet connection), so you barely notice the download time.
The best online slots sites UK still offer mobile apps for their casinos, but it’s a number that’s diminishing. There’s really no need for a mobile app anyhow – if you want to play mobile slots, just whip open any mobile browser and navigate away just as you would on desktop!
Playing the best casino slots has always been popular and its likely that it always will be. There are steps you can take that will help you to get the most out of your online slots playing, and here are three tips that you need to follow in order to get the best out of your reel-spinning.
Blackjack is blackjack and roulette is roulette, but the best slots are something different because of the variety available. If you enjoy playing, for example, Starburst, then don’t revolve your slots playing around that one single game. Mix it up a little by exploring different slots sites, different slots providers and most important of all, different slots.
Bit of a no-brainer this one. There are plenty of very good slots with high RTPs. Always choose these in preference to ones with low RTPs. You are never guaranteed to win, but your chances of coming out on top after a long playing session is always better when you play slots with high RTPs, so always choose the best RTP slots.
If you are playing a new slot, then try and use bonus money. That way, if you find the slot a disappointment, you won’t lose any of your own cash.
Some bonus spins offers can only be used on one slot – if it’s a slot you’ve not played before it’s a great way of maybe making a new slotting friend.
You may be shaking your head at that statement, thinking that winning money is another reason to play slots. Well yes, sure, but winning money is enjoyable!
Slots are meant to entertain you. If you are playing a slot for any other reason than enjoyment, then you should stop playing it immediately.
Poker at the highest levels is a game of fast math and keeping cool, calm and collected. When a poker player makes a bad play because of any emotions they are feeling, it is called ’tilting’ (in reference to tilting a pinball machine due to frustration).
You need to be level-headed when playing a slot. They can be volatile, meaning that long losing streaks are inevitable. When this happens you need to keep playing the same way you’ve always been playing and you are less likely to be able to keep calm if you are tired, emotional or have had a beer or two.
Slots have really taken over the online casino realm, and while some casinophiles will think this to be a bad thing, most people think the opposite. Slots have always been a staple of real-world casinos (they are the first thing you encounter when you enter a Las Vegas casino) so it’s no surprise that they’ve because the online casino staple too.
We hope this guide will enable you to get the most from your slots playing and help you to choose the best UK slots sites. Remember, always gamble responsibly and never chase your losses.
Slots providers need licences in order to operate. As part of that licensing, they have to make their games available for independent testing. If a test states that a slot is not random enough, then it cannot be released. If a provider repeatedly fails tests for randomness, then it risks having its licence revoked.
You cannot use the martingale system (double your bet if you lose) to guarantee any kind of win. The system has long been proven not to work.
Yes! Some companies (Blueprint Gaming are the industry leader; Barcrest and Novomatic too) lease cabinets to pubs, bars and clubs that house all their online slots games.
All wins on a slot are paid automatically - you don't have to worry about claiming a win. You can look at the slot's info pages to see which paylines are available.
No. In the unlikely event of this happening then most slots will only pay the higher of the two payouts that you have landed.
Most Megaways slots have that number. This is because a spin can have six reels of seven symbols. This means there are 7^6 (7x7x7x7x7x7) = 117,649 paylines.
Some slots claim to have an infinite number of paylines via a slot mechanic when an extra reel is added every time you land a win. In reality, if a slot managed to obtain infinity paylines you'd be long dead before the slot paid out! The slot '1 Million Megaways BC' can have a maximum of 1,058,841 paylines.
Peter is an experienced iGaming wordsmith who has been working in the industry since 2013. He has written more words on all aspects of iGaming than he cares to remember, and has provided content for many big industry names. When not writing Peter can be found out running or gaming on his Xbox.
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