Slot Guides
Slot Tips
On this page you’ll find
What are online slots games?
Slots are simple games where you spin the reels to form a winning line. To form such a pay line, you need to land matching symbols. And when you do, you win. Told you, it’s simple. The games are the adaptation of the physical land-based casino or pub slots that can be played on a desktop or mobile device. But with improved themes, features and gameplay. One of the best things about slots is that there are so many different themes you can enjoy. From classic fruit and futuristic to fantasy and reality TV. Another great thing is that the software providers release new slots on a weekly or monthly basis. So, you’ll always find something to suit your playing style and budget. Plus, you can play for real money or fun. Most of our recommended casinos have a good variety of games available in demo mode. Simply choose a slot and have fun without spending a penny. We will explain in more detail what kind of slots you can play further down this page. But for now, let’s see how to spot a good online game. 
What makes a good online slot game?
It takes a little bit of practice to know what makes a good online game. But we’ve got some nice tips to help you pick the right slot. Here’s what you should look for when choosing an online game:
- Bonus Features – A good slot game should have a blend of bonus features to help you form that winning line. And to be fun to play. Look out for bonus games and free spins feature, re-spins, multipliers, wilds, scatters. Also check if there are any expanding reels, colossal symbols, wins both ways, or 243+ ways to win. These make fantastic gameplay.
- Compelling Theme – An exciting theme makes an exciting slot. Funny critters and mesmerising designs make games fun and immersive. Take the fabulous Book of Dead or Immortal Romance slot as an example. Or ancient Egypt themed slots like the Book of Ra. All have beautiful themes rich in colour and mystery.
- Max and min bet – Min and max bets are important in slot machines and those that offer a max bet are the ones you should look out for. Especially because many of the online jackpots can only be won with the max bet. And in general, you get a higher payout percentage when betting max, depending on the slot.
- Jackpot(s) – Who doesn’t love online slot games where you can hit a life-changing jackpot while having fun. While smaller jackpots might not be as attractive, big jackpots don’t get snagged very often. So, mix it up a little. Play a variety of jackpot slots.
- RTP & Volatility – Good slots games have medium to high RTP. The higher the RTP, the better the payouts. But don’t rush to dismiss slots with lower than the average (96%) RTP. While many slots have a fixed return to player percentage, some can increase the more you play.
- Mobile Slots – It’s always nice to have a high-quality mobile version of your favourite slot. Having the option to load up games on your smartphone is simply a convenience.
Why should you play online slots?
The excitement of potential winnings while having fun makes online slots some of the most popular online casino games. And, unlike table games, slots are easy to play and don’t require special skills. But there’s more to slots games than just easy fun. Let’s take a quick look at why you should play online slots.
- Convenience – Not all of us have the luxury of jetting off to Las Vegas for a night of a lifetime. But, thanks to online gaming, you can join a casino online and play you favourite games anytime. More so, you can test many slots for free.
- Wide Selection of Slots – Another perk of playing online is the infinite selection of slots available at online sites. You can access games with the best odds, the best graphics and the most entertaining gameplay, instantly. Check out our slot reviews to find out which ones are the top slots to play in the UK.
- Play On The Go – You’ll never be out of slot action with mobile gaming. Most of the respected game developers create online games using HTML5 technology. This way they cater to players who love spinning on the go. Which is, let’s face it, the majority today.
- Bonus and Special Features – Another reason to play online slots is for their extra bonuses, free spins and special features. Such components can positively impact your gameplay by creating more winning chances while enhancing your gaming experience.
These are just a few perks of playing at online casinos. Remember to check our recommendations for the best online casino sites in the UK. 
Find the Best Slots to Play Online
Not sure where to start to find the best slots? Have a look at the quick overview below. Here we’ve covered 4 most popular slot styles.
- Video slots
- Fruit slots
- Jackpot slots
- 3D slots
Video Slots
Derived from the traditional land-based fruit machines, video slots are the key games at many online casinos. Each of the games has a different number of reels, rows and pay lines. They can also come packed full of special features such as bonus games and free spins. Think of fun slots such as NetEnt’s Gonzo’s Quest or the legendary Book of Dead by Play’n GO. You just have to choose the right casino.
Fruit Slots
Fruit slots go way back to the days when online gaming wasn’t so easily accessible. They were simple pub slots that featured fruit symbols on the reels. Players liked them because they were easy and fun to play. Today the best online fruit slots have added features, colour-bursting graphics and captivating soundtracks. Why not try Microgaming’s Deco Diamonds, Twin Spin by NetEnt or Imperial Fruit by Playson. We have them all at JohnSlots.
Jackpot Slots
These kinds of slots are known as millionaire-maker slots. Think NetEnt’s Mega Fortune or Microgaming’s Mega Moolah. Online jackpots here are linked across many different online casinos and grow until they’re bagged by a lucky player. If you fancy giving it a go, check out our list of the top progressive online jackpot slots and where to play them.
3D Slots
3D slots are enriched with HD graphics making the games super fun to play on both your desktop and mobile. Jungle Jim El Dorado by Microgaming is a good example. Enhanced with beautifully crafted symbols it also comes with many special features. Among many captivating 3D slots, the epic Yggdrasil’s Vikings go to Hell slot has also been stealing the headlines. Loaded with plenty of bonus features it’s worth giving a quick spin.
Best Online Slots Sites
Struggling to choose a site to sign up with? We’ve been there too. That’s why we have a team of experts out in the field, testing and selecting the best slot sites for you. Here are the top 5 slot sites that made it to our shortlist:
CASINO REVIEW
PlayOJO
1ST DEPOSIT BONUS
50 No Wager Spins + 30 Exclusive Extra Spins
Only for 1st time depositors. Min deposit is £10. 50 Free Spins on Book of Dead. Spin Value: £0.10. After your 1st deposit you may claim your 30 Extra Free Spins by visiting the Kicker Section. No min withdrawal. Cannot be used in conjunction with any other offer. Only available for specific players that have been selected by PlayOJO. OJO’s Rewards and Game Play policy applies.
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PlayOJO
TOTAL WELCOME PACKAGE
80 Free Spins No Wagering
1ST DEPOSIT BONUS
50 No Wager Spins + 30 Exclusive Extra Spins
VISIT CASINO
Only for 1st time depositors. Min deposit is £10. 50 Free Spins on Book of Dead. Spin Value: £0.10. After your 1st deposit you may claim your 30 Extra Free Spins by visiting the Kicker Section. No min withdrawal. Cannot be used in conjunction with any other offer. Only available for specific players that have been selected by PlayOJO. OJO’s Rewards and Game Play policy applies.
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CASINO REVIEW
Betfair
1ST DEPOSIT BONUS
50 No Wager Spins
Offer open to new customers using promo code CASD11 when registering. No wagering required on free spins! Spins Valued At 10p. Free spins available for 7 days after qualifying.
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Betfair
TOTAL WELCOME PACKAGE
50 No Wagering Free Spins
1ST DEPOSIT BONUS
50 No Wager Spins
VISIT CASINO
Offer open to new customers using promo code CASD11 when registering. No wagering required on free spins! Spins Valued At 10p. Free spins available for 7 days after qualifying.
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CASINO REVIEW
Sky Vegas
ON REGISTRATION
50 No Wager Free Spins
1ST DEPOSIT BONUS
200 Free Spins for £10
Opt In Required. 7 Day Free Spin Expiry. All Free Spins Will Auto Play On First Eligible Game Loaded. £10 Staking Requirement Must Be Met Within 30 Days Of Opt In. Eligibility Restrictions Apply. Further Terms Apply.
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Sky Vegas
TOTAL WELCOME PACKAGE
250 Free Spins
ON REGISTRATION
50 No Wager Free Spins
1ST DEPOSIT BONUS
200 Free Spins for £10
VISIT CASINO
Opt In Required. 7 Day Free Spin Expiry. All Free Spins Will Auto Play On First Eligible Game Loaded. £10 Staking Requirement Must Be Met Within 30 Days Of Opt In. Eligibility Restrictions Apply. Further Terms Apply.
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CASINO REVIEW
Videoslots
ON REGISTRATION
11 free spins no wagering
1ST DEPOSIT BONUS
100% bonus up to £200
11 Welcome Spins Wager-free and 100% up to £200 on your 1st deposit. Min. deposit £10. 7 days to activate the spins. Bonus spins expire 24 hours after activation. Activate the Welcome Bonus within thirty (30) calendar days under the 'My Bonuses’ section. 100% bonus up to £ 200 will be paid out in 10% increments to Main Account balance. 35x wagering. Play Responsibly.
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Videoslots
TOTAL WELCOME PACKAGE
£200
+ 11 free spins no wagering
ON REGISTRATION
11 free spins no wagering
1ST DEPOSIT BONUS
100% bonus up to £200
VISIT CASINO
11 Welcome Spins Wager-free and 100% up to £200 on your 1st deposit. Min. deposit £10. 7 days to activate the spins. Bonus spins expire 24 hours after activation. Activate the Welcome Bonus within thirty (30) calendar days under the 'My Bonuses’ section. 100% bonus up to £ 200 will be paid out in 10% increments to Main Account balance. 35x wagering. Play Responsibly.
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CASINO REVIEW
LeoVegas
ON REGISTRATION
10 Free Spins
1ST DEPOSIT BONUS
100% bonus up to £100 + 20 Wager-Free Spins
Full T&Cs apply. No deposit needed. 3 days to claim & 3 day expiry. 10x free spins worth 10p on Book of Dead. Deposit offers available across any two deposits. Cash rewards 7 days from registration to opt-in from “Promotions” page & each with 7 days wagering. Deposit £10, £25 or £50 & wager 35x. Only cash stakes qualify & wagering contributions vary. 10 free spins worth £0.10 to be claimed within Book of Dead with each qualifying deposit, 3 day expiry.
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LeoVegas
TOTAL WELCOME PACKAGE
£100
+ 20 Wager-Free Spins
ON REGISTRATION
10 Free Spins
1ST DEPOSIT BONUS
100% bonus up to £100 + 20 Wager-Free Spins
VISIT CASINO
Full T&Cs apply. No deposit needed. 3 days to claim & 3 day expiry. 10x free spins worth 10p on Book of Dead. Deposit offers available across any two deposits. Cash rewards 7 days from registration to opt-in from “Promotions” page & each with 7 days wagering. Deposit £10, £25 or £50 & wager 35x. Only cash stakes qualify & wagering contributions vary. 10 free spins worth £0.10 to be claimed within Book of Dead with each qualifying deposit, 3 day expiry.
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Best Online Slots Games
With an infinite amount of games, how do you even begin to decide what are the best slots to play online. We feel your pain so we sent our slots team to do the digging. They say the top 10 online slots below are a good place to start.
1. Starburst
This gem of a game is one of the most recognisable slots in the iGaming industry. Players just can’t get enough of its dazzling gem-encrusted theme and win both ways expanding wilds. It’s also a medium variance slot meaning that the wins here are frequent. And despite the lack of in-game bonus features, Starburst is still one of the top online slots from NetEnt.
2. Gonzo’s Quest
Beautifully crafted, equipped with tumbling reels and increasing multipliers, Gonzo’s quest is one of the best slots to play online. It’s highly entertaining, with frequent payouts and beautiful Aztec jungle theme. Just like Starburst, Gonzo’s Quest slot is not a game of many special bonuses and yet it’s stolen many players’ hearts.
3. Mega Fortune
Known as the millionaire-maker slot, Mega Fortune is well-known among the slots enthusiasts. It’s all about the luxury here. The yachts, the sparkle, the champagne. NetEnt sure knows how to create immersive gameplay. And with 3 jackpots up for grabs, it never stops featuring among the top 10 online slots to play in the UK.
4. Book of Dead
If we had to list the best online slots in the UK, the Book of Dead slot would make the cut. The graphics here are stunning. This high variance game comes with many in-game bonus features to help you win including free spins, expanding wilds and scatter symbols. A risky game though. Just like the many other online slots by Play’n GO.
5. Immortal Romance
Immortal Romance is such a vivid online slot and one of the top slot games from Microgaming. It comes with 243 pay lines, a multifold of bonus features and big payouts. The supernatural vampire theme is exceptional too, expertly executed with detailed graphics and an eerie soundtrack. We can’t fault this game.
6. Mega Moolah
Microgaming’s Mega Moolah is another record-breaking slot game that could bring you many riches. It’s rigged with 4 progressive jackpots: Mini, Minor, Major and Mega. Each starts at 10, 100, 10, 000, and 1 million respectively. And because the slot pays out randomly, you can win on any spin. As a rule of thumb, the higher you bet, the bigger the payout.
7. Vikings Go to Hell
A strong favourite by Yggdrasil is the hardcore Vikings go to Hell slot. The last but not least in their Viking-themed trilogy, the slot is brilliant, beautiful and extremely high-risk. It’s not your ordinary gentle game from Yggdrasil’s slot collection. But if you think you can handle the pressure, then join the Vikings, collect your rage points and go battle the fallen angel.
8. Jokerizer
This Yggdrasil slot grows on us each time we play it. It’s fun, well made and pays both ways but comes as a high variance game. It has one special in-game feature, the Jokerizer Mode, to help you win some cash. If you are lucky, you can win 600x your bet here. Don’t expect to win too often but do give this slot a spin. It’s the players’ favourite for a good reason.
9. Blood Suckers
UK players love the vampire-slaying Bloodsuckers. With endless payouts and rewarding bonus features, it makes a fun and spooky gameplay. More so, the slot comes with lots of great in-game features and a 5-level bonus game. Here you could land a 2x or 3x multiplier, depending on your luck.
10. John Hunter
We’re super excited about John Hunter since we haven’t had the chance to mention any of the Pragmatic slots yet. The adventurous Indiana Jones inspired online game comes with several bonus features and astonishing 7,776 ways to win. It’s also volatile so beware of lack of payouts. You’ll need 5x or higher multipliers to land a win. A piece of quick advice would be to stay calm and look out for those bonus spins. This is where the real treasure lies.
Best Slot Game Providers
Many online games providers deliver on their promise to create fun video slots. But only a handful put their heart and soul into the slot development process. And only those that do, have made it to our shortlist of the top game developers in the UK. Take a look.
- NetEnt
- Yggdrasil
- Play’n GO
- Microgaming
- Pragmatic Play
1. NetEnt
The software leader in the gaming industry, NetEnt has been developing some of the most exciting online slots for over 20 years. During which, the developer has brought to life Starburst and Gonzo’s Quest, the two most loved games among many UK slots players. Today, they continue to strengthen their brand by releasing slots chock-full of unique features and ground-breaking bonus games. Jumanji and Planet of the Apes are both good examples as are the vampire-slaying slots Bloodsuckers I and II. And let’s not forget their millionaire-maker pooled jackpots such as Mega Fortune, Hall of Gods, Arabian Nights, and Mega Fortune Dreams.
2. Yggdrasil
As an up and coming games studio, Yggdrasil has been breaking the glass ceiling since 2013. Starting with their mysterious brand name, they’ve been indulging slots players with amazing Nordic and Egyptian themes. Their cold and icy Viking trilogy with the latest Vikings Go To Hell title was well received by players around the world. The stunning Valley of the Gods didn’t go unnoticed either. Featuring stunning graphics and the 3,125 ways to win mechanism, the slot has been a hit among UK players since its release. We are excited to see what’s coming next from this player-focused games studio.
3. Play’n GO
Due to their immersive gameplay and mobile-friendly content, Play’n GO is represented in many casinos across the world. The Book of Dead slot, a fetching replica of Book of Ra, is the definition of Play’n GO provider. Ever since its release, the game has been a testament to the developer’s endless love for slots. Their collection has all kinds of video slots. From easy to play slots to exceptional games with daring gameplay. Such is the Queen’s Day Tilt slot with a moving grid and wild falls for endless wins.
4. Microgaming
Operating since 1994, Microgaming has created many titles that we all know and love. Take the vampire-themed Immortal Romance, for example. Packed with exciting features, the 243 ways to win slot is one of the most loved slots by UK players. With new online games released every month, their slots collection is endless. Whether you like fantasy or TV show themes, you’ll find them here. The latter include Terminator and the Love Island slot among many. Microgaming is also at the top of the leaderboard in the progressive jackpot slots category. Their Mega Moolah progressive jackpot slot holds the record for the biggest ever online slot payout of £13,209,300. Need we say more?
5. Quickspin
With Quickspin you can experience both real money casinos and social gaming. Co-founded in 2011, the stylish new kid on the block has already been praised for its exceptional impact on the gaming industry. Their main goal to deliver superior games right to your desktop (and mobile) is the main driving force behind this Swedish brand. Eastern Emeralds, Sticky Bandits and Spinions Beach Party are just a few of their slots loved by British players and worldwide punters alike. The great news is their library keeps growing rapidly. New exciting mobile-optimised slots titles are added as you read.
Stay Up to Date with JohnSlots
Software technology never sleeps. It keeps improving allowing game developers to create more awesome content for online casinos. Be sure to frequently check in with our slots page for new slot reviews. Alternatively, stay up to date via our news section where we share the latest news about new releases, exciting competitions and other industry tidings. 
Did You Know This about Slots?
Need more information? Here you’ll find answers to some of the most frequently asked questions about online slots by UK players.
What type of slot gives the highest chance at winning?
The slots with the highest chance of winning are determined by the RTP of that slot combined with its volatility. A slot with a high RTP will see more frequent return but the level of these returns is based on the volatility of the slot. Check out the how-to win at slots guide on our site to learn more.
How do I know if a casino has the slot I want?
Most casinos will have a search bar where you can look for the slot you are after. Alternatively, you can search for your favourite slots by the games provider. If the games studio is on the list, chances are your game is in the library.
What is RTP?
RTP is the return to player percentage of a game. It dictates how much return on your investment a slot will provide over time on average. The higher the RTP, the better the payout. Head over to our RTP guide, if you need more guidance.
How do I know the RTP or volatility of a slot?
Some slots may display the RTP and volatility in their information section. If you can’t find it, check our slot reviews. We always mention this information at the top of the review.
How do I get free spins to a new slot?
Free spins can be awarded in the form of a bonus and can be claimed in several ways, depending on the casino. Many casinos offer bonus spins to new slot releases. Alternatively, you can win them via the in-game bonus feature.
Can I win money from free slots?
Not exactly. Demo games won’t award you real money. But you can win via bonuses, such as free spins. Another way is to play a game with a no deposit bonus. This allows you to play free slots and win before you deposit with your cash.
How do I play free slots in the UK?
Most of UK casinos have a library of slots available in demo mode so you can play for fun. Simply choose a casino, create an account, go to the slots library and play for free. If you, however, aren’t sure which one to choose, try our recommended casinos. Most of them have free slots for you to enjoy.
What are no deposit slots?
No deposit slots are simply slots that do not require you to deposit before you play them. They come with no deposit free spins or free play with bonus cash. Winnings from such slots are yours to keep.
What are the demo slots?
Demo slots are slots that you can play for free and test out gameplay without having to make a deposit or join a casino. In some cases though, you’ll have to create an account with the casino to be able to spin free slots.
What’s an offline slot?
Offline slots are slots machines that you’ll find in pubs or land-based casinos. Offline slots can also mean that you can play them via downloadable casinos. Such casinos can be downloaded on your desktop via the software provided by the casino or a dedicated app on your mobile.
What are exclusive slots?
Exclusive slots are slots that are designed for a certain casino and aren’t available anywhere else. mFortune is the perfect example of exclusive content. All their casino games are developed in-house to be played exclusively at the casino.
Can I play slots on mobile?
Absolutely. Majority of new slots come fully optimised for all mobile devices by using the HTML5 software. Some of the older slots, however, may only be available to play on your desktop.
How often are new slots released?
Depending on the software provider, new slots can be released as often as weekly. Most of the top software providers release new slots monthly.
What is a progressive jackpot?
A progressive jackpot is a jackpot that grows over time as more people play it. Some of the most popular are pooled jackpots like Mega Moolah, Mega Fortune and the Hall of Gods slot among many.
What is a local vs network jackpot?
A local jackpot is a jackpot offered by one casino. A network jackpot is a jackpot provided by numerous casinos offering that same slot game.
How to win a jackpot?
There is no proven strategy to help you win an online jackpot. But you can adjust your game to better your chances. Patience and knowing the game specifics such as the RTP is the key. For tips and advice on hitting an epic jackpot, check our helpful jackpot guide.
What are slot tournaments and where can I play them?
Slot tournaments are competitions at casinos where every player can compete on selected games to win cash prizes and amazing gifts. While many online casinos offer various tournaments, PlayFrank and 888Casino have some of the most exciting and lucrative competitions.
Are slots luck based?
Essentially, yes. However, they are not based on superstitions and you shouldn’t follow any slot winning trends. Slots are built on random number generators, therefore, the results are always completely random. Elements like bonus games and other special features can help you win, but other than that, all you can do is have fun and hope for the best.
How many slots are there?
That’s a good question. There are thousands of slots available by different providers and the number is growing every day. If you are feeling lost in the sea of online games, try choosing by the theme, provider or our recommendations.
