Play the best casino slot games for UK players

The best online slots of 2021: top 10 slot games ranked

Find the best slots to play, uk slot sites to join, and bonuses to claim in 2021.

Are you looking for the best slots to play online? Our new slot game ranking is here to help. We’ve put together a list of our favourite releases from the top providers. Awesome games based on graphics, gameplay, volatility, jackpot, RTP, spins, betting limits, bonuses and features.

We have spent a long time playing casino games and online slot machines. Slotsquad’s guide to the very best slot games in the UK market includes everything you need. We know it’s not all about how much you can win, but how you win. It’s also about which casinos you choose to play and the slot bonuses you claim in the process.

Best casino slot at a glance:

  1. Fluffy Favourites Megaways
  2. Thunder Screech
  3. Hot Wild 7s
  4. Dragon’s Fire InfiniReels
  5. Big Money Frenzy
  6. The Faces of Freya
  7. Cluedo Cash Mystery
  8. Grand Loot
  9. Red Hot Gambler
  10. Joker King

The top online slots not only look fantastic, but will entertain, allow adjustable bets, offer free spins and include lots of cool ways to win. Whether free play or real money, find out how to choose the right game, the best slot sites, and which in-play bonus features are paying out in 2021.

10 new casino slot games and the best slot sites + bonuses


1. Fluffy Favourites Megaways
Our Best Slot of 2021
Why play this game?
Enjoy all the fun of the Fluffy Fairground with all the excitement of a MEGAWAYS game engine!
Eyecon Fluffy Favourites Slot
  • Software: Eyecon
  • Theme: Grabbing Machine
  • Paylines: Up to 117,649 Ways to Win
  • RTP Payout Rate: 96.0%
  • Features: Cascading Reels, Multiplier, Claw Grabbing Game, Free Spins
  • Max Win: 25,000 x
  • Bets: Free Demo / 20p – £10

Featured Slot Site and Casino Bonus
Find the best slots to play online in 2021
Play Fluffy Favourites Megaways at Watch my Spin
Up to £350 Bonus
+ 200 Spins
VISIT WATCH MY SPIN
*New players only. 50% Match on 1st Deposit, Min dep £10. Max bonus £100 and 100 spins on Selected Slots. 40x wagering (dep + bonus), 40x wagering on spins, 4x conversion. Full T&Cs apply. BeGambleAware.org

Watch My Spin Casino Review


2. Thunder Screech
Best Multipliers Casino Slot
Why play this game?
Activate the Strike Feature to trigger respins and multiply wins up to 9x with Thunder Wilds.
Play'n Go Thunder Screech
  • Software: Play’n Go
  • Theme: Native American
  • Paylines: 10
  • RTP Payout Rate: 96.2%
  • Features: Thunder Screech Call, Strike Bonus, Free Spins, Multipliers
  • Max Win: 5,000 x
  • Bets: Free Demo / 10p – £100

Featured Slot Site and Casino Bonus
Play the best slots to win at Masked Singer Games UK
Play Thunder Screech at Masked Singer Games UK
Deposit and play Prize Twister
Win Free Spins or up to £25K Cash
VISIT MASKED SINGER GAMES
Min deposit: £10. Game: Masked Singer UK, Spin Value: £0.10. The Prize Twister awards a random prize of either cash or free spins. WR 60x free spin winnings amount (only Slots count) within 30 days. Max bet is 10% (min £0.10) of the free spin winnings amount or £5 (lowest amount applies). Spins must be used and/or Bonus must be claimed before using deposited funds. Bonus Policy applies. www.begambleaware.org #AD

Masked Singer Games UK Review


3. Hot Wild 7s
Top Classic Fruit Slot
Why play this game?
An impressive all-rounder slot machine with an old-school appeal, but with modern sound, animation and plenty of free spins.
Hot Wild 7s
  • Software: Pariplay
  • Theme: Fruit Machine
  • Paylines: 40
  • RTP Payout Rate: 94.0%
  • Features: Free Spins, Stacked Symbols, Wilds
  • Max Win: 2,000 x
  • Bets: Free Demo / 10p – £10

Featured Slot Site and Casino Bonus
Griffon Casino
Play Hot Wild 7s at Griffon Casino
3 Deposit Bonuses
Up to 200 Bonus Spins
VISIT GRIFFON CASINO
18+. Welcome bonus: new UK depositing players only. 200 spins require 3 deposits of min. ‎£20 each and are issued as follows: 50 on 1st deposit, 50 on 2nd deposit and 100 on 3rd deposit. Spins are issued on selected games. Winnings from spins are bonus with wagering requirements 35x. Spins expire after 24 hours. Bonus expires after 21 days. Play responsibly, www.begambleaware.org. T&Cs apply. www.begambleaware.org #AD

Griffon Casino Review


4. Dragon’s Fire InfiniReels
Best Feature Mechanics
Why play this game?
The only way to improve Dragon’s Fire was by adding NetEnt’s InfiniReels, so guess what? Red Tiger’s just gone and done it!
Dragon's Fire InfiniReels Slot by Red Tiger
  • Software: Red Tiger
  • Theme: Fantasy Adventure
  • Paylines: InfiniReels
  • RTP Payout Rate: 95.74%
  • Features: Fire Egg, Fire Wilds, Dragon Spins, Multipliers
  • Max Win: 10,414 x
  • Bets: Free Demo / 10p – £10

Featured Slot Site and Casino Bonus
Play top casino slots UK at Casino Planet
Play Dragon’s Fire InfiniReels at Casino Planet
100% up to £100
+ 200 Free Spins
VISIT CASINO PLANET
18+, new customers only, Full T&C’s apply, £10 min deposit. £30 max bet using bonus. 40x wagering applies. Bonus valid for 14 days. Skrill + Neteller excluded. www.begambleaware.org #AD

Casino Planet Review


5. Big Money Frenzy
Why play this game?
Money Spins and Frenzy Spins present players with two respin streak features that pay cash prizes as you spin.
Blueprint Gaming Big Money Frenzy Slot
  • Software: Blueprint Gaming
  • Theme: Wealth
  • Paylines: 10
  • RTP Payout Rate: 96.05%
  • Features: Money Spins, Hold and Wins, Respins, Frenzy Spins, Transforming Symbols
  • Max Win: 500 x
  • Bets: Free Demo / 10p – £200

Featured Slot Site and Casino Bonus
Watch my Spin Casino Slots
Play Big Money Frenzy at Watch my Spin
Up to £350 Bonus
+ 200 Spins
VISIT WATCH MY SPIN
*New players only. 50% Match on 1st Deposit, Min dep £10. Max bonus £100 and 100 spins on Selected Slots. 40x wagering (dep + bonus), 40x wagering on spins, 4x conversion. Full T&Cs apply. BeGambleAware.org

6. The Faces of Freya
Brand New
Why play this game?
The ultimate Folkvang Free Spins Game includes 4 different levels of rewards and a total of 18 or 19 free spins!
Play N' Go The Faces of Freya
  • Software: Play ‘n Go
  • Theme: Norse Mythology
  • Paylines: 20
  • RTP Payout Rate: 96.2%
  • Features: Spins of Sorcery, Spins of Love, Spins of War, Folkvang Free Spins
  • Max Win: 5,000 x
  • Bets: Free Demo / 20p – £100

Featured Slot Site and Casino Bonus
Top UK slot games at Karamba
Play The Faces of Freya at Karamba Casino
100% up to £50
+ 100 Free Spins
VISIT KARAMBA CASINO
18+, new customers only, T&Cs apply, 35x wagering, min deposit £10. BeGambleAware.org #AD

Karamba Review


7. Cluedo Cash Mystery
Top Mystery Slot Game
Why play this game?
17 different scatters and 180 different bonus combinations in the main Cluedo Mystery free spins game.
Cluedo Cash Mystery Slot Game
  • Software: WMS
  • Theme: Murder Mystery
  • Paylines: 20
  • RTP Payout Rate: 96.5%
  • Features: Wilds, Scatters, Free Spins, Pay Both Ways, Multipliers
  • Max Win: 12,000 x
  • Bets: Free Demo / 20p – £200

Featured Slot Site and Casino Bonus
Spin and Win Casino
Play Cluedo Cash Mystery at Spin and Win Casino
100% up to £250
+ up to 100 Free Spins
VISIT SPIN AND WIN
Min 1st deposit £20. Max bonus £250. Bonus & wins playable on Selected games only. 40xWR. Max convertible to real 5x bonus amount. Bonus valid for 7 days. Free Spin on the wheel for 10 – 100 spins valid for 24 hrs. Spins & wins playable on NetEnt Slots (excl. progressives). 30WR. Max win £20 from wheel spins. T&Cs apply. #AD

Spin and Win Review


8. Grand Loot
Brand New
Why play this game?
As one of the best slot games with Random Multipliers, Grand Loot adds tommy guns, mega wins and a whopping 50,000x max win to Pariplay’s free spins model.
Grand Loot from Pariplay is one of the top UK slot games out now
  • Software: Pariplay
  • Theme: Crime
  • Paylines: 40
  • RTP Payout Rate: 96.24%
  • Features: Grand Loot Bonus, Random Multipliers, Free Spins
  • Max Win: 50,000 x
  • Bets: Free Demo / 50p – £5

Featured Slot Site and Casino Bonus
Our top rated slot games at Casiplay Casino
Play Grand Loot at Casiplay Casino
Up to £100 Bonus
+ 150 Extra Spins
VISIT CASIPLAY CASINO
18+, new customers only, T&Cs apply, wagering bonus 35x, min deposit £20. BeGambleAware.org #AD

Casiplay Review


9. Red Hot Gambler
Top Fruit Machine Simulator
Why play this game?
At the end of any losing game, the fruit machine may offer 1 to 3 nudges. If you don’t win from the nudges, the Super Spin feature may activate with a guaranteed win.
Red Hot Gambler Slot Realistic Games
  • Software: Realistic Games
  • Theme: Pub Fruit Machine
  • Paylines: 1
  • RTP Payout Rate: 96.5%
  • Features: Nudges, Super Spin, Red Hot Reel, Gamble
  • Max Win: 2,500 x
  • Bets: Free Demo / 5p – £20

Featured Slot Site and Casino Bonus
Play the newest UK slot games at Mayfair Casino
Play Red Hot Gambler at Mayfair Casino
Up to £400 Bonus
+ 175 Spins
VISIT MAYFAIR CASINO
18+, new customers only, Over first 3 deposits, T&Cs apply, 30x wagering, min deposit £10. BeGambleAware.org #AD

Mayfair Casino London


10. Joker King
Why play this game?
More crowns mean more free spins, so landing 3, 4, 5 or 6 crown Scatters on the same free spin will add a round of 8, 10, 15 or 20 free spins to the total.
Joker King
  • Software: Pragmatic Play
  • Theme: Classic Slot
  • Paylines: 25
  • RTP Payout Rate: 96.5%
  • Features: Joker Wilds, Scatter Multipliers, Free Spins, Wild Extras
  • Max Win: 5,000 x
  • Bets: Free Demo / 5p – £20

Featured Slot Site and Casino Bonus
Play the best slots to win at Masked Singer Games UK
Play Joker King at Masked Singer Games UK
Deposit and play Prize Twister
Win Free Spins or up to £25K Cash
VISIT MASKED SINGER GAMES
Min deposit: £10. Game: Masked Singer UK, Spin Value: £0.10. The Prize Twister awards a random prize of either cash or free spins. WR 60x free spin winnings amount (only Slots count) within 30 days. Max bet is 10% (min £0.10) of the free spin winnings amount or £5 (lowest amount applies). Spins must be used and/or Bonus must be claimed before using deposited funds. Bonus Policy applies. www.begambleaware.org #AD

In many ways, features and RTP create the highest paying online slots by mixing bonus games with improved payout rates. Use this table to compare RTP and features from our current top ten slots list.

Rank Game RTP Best Feature
1 Fluffy Favourites Megaways 95.0% Claw Grab Bonus
2 Thunder Screech 95.2% Strike Feature
3 Hot Wild 7s 94.0% Free Spins
4 Dragon’s Fire InfiniReels 95.74% Fire Egg
5 Big Money Frenzy 96.05% Frenzy Spins
6 The Faces of Freya 96.2% Spins of War
7 Cludeo Cash Mystery 96.5% Cluedo Game
8 Grand Loot 96.24% Grand Loot Bonus
9 Red Hot Gambler 95.5% Dragonfire
10 Joker King 96.5% Joker Wilds

How to play the best casino slot games in 2021

We compare the best slots to play online by selecting new games from the top casinos. The new slots of 2021 are already looking stuffed with features. Due in part to the competition, but how do you find the best slot games amidst hundreds and thousands of choices?

As your big guide to the online slot games worth playing this year, at the top of this page, you’ll find a list of new releases that we strongly recommend. From 1 – 10, we’ve highlighted the biggest and most anticipated slots that will launch in 2021 – updated every month with the latest casino content.

In this guide, we cover the most important things to consider before playing new online slots. As well as highlighting the best UK slot sites and bonuses if you play for real money.

Updated weekly, Slotsquad’s 10 best online slots section brings you the latest games releases from the top providers. We’ll show you screenshots, why to play, how much to play, how much you can win playing, jackpots, RTP and whether free play is available. You’ll also find in-play bonus features and how each online casino compares on welcome bonuses.

How much does it cost to play the best rated online slots?

UK slot players should always consider how much it costs to play when you gamble using real money. One advantage of playing the best rated online slots is free play, often as demo content. You’ll find that most slot sites offer demos when it comes to the latest releases – ideal if you want to try before you bet. That’s why we rank new slot games, because we know there’s an option to play for free.

Compare slot games by cost per spin/bet

Unlike demo slots, real money play allows for the chance to win prizes or claim deposit bonuses. But be aware that some slot games can cost the earth for a single spin. We list the minimum and maximum bet for every casino game listed so you can compare prices per play.

Pick a provider

Who makes the best slots to play online? This is not an easy question to answer, especially if you’re not familiar with casino game providers. But what we can do is look for trends in the 2021 UK market.

Most UK slots come with strengths and weaknesses, the biggest drawback being repetition – something online slot machines find hard to avoid. By picking the best provider, you’ll find casino slots that entertain using a combination of graphics, gameplay and features.

Monitoring the likes of Play’n Go, NetEnt and Microgaming means we’re always looking at the best providers. These companies like to improve their games, weed out what doesn’t work and build on the features that UK slot players enjoy. By picking these providers, we’re pretty sure we can find online slots worth ranking – and we do.

Choose the right slot game features

Many online slots fall into the category of feature games, a casino slot that can payout using multiple features to create win lines. Not only can you win in the base game, but you can also win using free spins, multipliers and extra functions beyond the base game. Most of these features are in multiple games, but it’s finding more features in the same game that counts.

The best online slot games to win are new slots with the following in-play bonuses:

  • Free Spins
  • Multipliers
  • Jackpots
  • Wilds, Stacked Wilds, Random Wilds, Expanding Wilds, Walking Wilds
  • Sticky Multiplier Wilds
  • Expanding Reels
  • Bonus Wheels
  • Re-Spins
  • Free Spins Re-Triggers
  • Scatters
  • Expanding Symbols
  • Mystery Symbols
  • Special Symbols
  • Pay Lines (Ways to Win)
  • Bonus Wilds
  • Pick and Win Game
  • Gamble Feature
  • Buy Bonus Feature

Look closely at our 10 best online slots of 2021 and what each game offers in terms of features. We’ll tell you why to play, the maximum you can win on any bet and which in-play bonuses you could find on the reels.

How many ways to win?

Pay lines refer to ways to win. Ways to win are the number of lines programmed into any given online slot machine. These days, you’ll find casino slot games packed with more and more ways to win. And, slots with lots of pay lines are often good but more expensive to play.

When comparing new online slots in 2021, anywhere from 50 pay lines to thousands of ways to win is considered decent spec. 

Ways to win are important as they work with the slots pay table to form pay outs. With more pay lines, you can trigger more winning combinations, bonus games and other features.

When we look for the best slots to play at UK casinos, pay lines is something we take into consideration. A good tip for UK slot players is to find games with lots of pay lines, features, a higher RTP and a lower minimum bet. Lower the better. In our list of top-rated online slots, we’ve included ways to win so you can compare your options.

What should I look for in slots RTP payout rate?

As slot games are controlled entirely by RTP and pay tables, players should look for the highest RTP slots if playing for real money. In 2021, anything between 93.0% and 95.0% is average, 96.0% – 97.0% RTP is better than average, and anything over 97.0% RTP is considered high.

A larger payout rate, RTP measured across thousands of spins, will give players more wins over time. But that doesn’t necessarily mean you and in your game. However, Return to player is a percentage that drives competition between developers – often pushing them above 96.0% RTP on new releases.

So, high RTP slots might not always be the best online slot games to win. Still, they’re likely to be competitive, meaning better gameplay, features and occasionally better winning chances.

Our 10 best slot games will give you a good idea of what RTP developers are currently using.

Slot game theme and setting

Game themes are the genre, settings, backgrounds, sounds and scenarios in any online slot machine. Developers might use space, adventure, wild west, classic fruit machines, retro, action or even Christmas to decorate their products. As the subject matter the slot is built around, themes can enhance gameplay, entertainment, and features using specific genres.

Whether it’s an ocean adventure, emeralds on other worlds or Irish Folklore, 80% of your gaming experience is down to the theme.

The sheer volume of slot casinos can make finding the best games difficult. To help, we follow the trends of the latest releases by watching only the top UK casinos. That way, we know what’s popular, what’s good and which type of theme is trending at this very moment.

If you look at our top 10 online slots, you’ll find of list of slot games from the new and popular game sections of multiple casino sites. Some takeouts from these rankings will offer more features than others, but our number 1 slot will be the game of choice that we highly recommend at the time of updating. We update the list each week and review slot bonuses monthly. 

We look at game themes and genres because they help us identify trends and offers in the current UK casino market.

Jackpots, progressive jackpots and maximum win

If you want to pay a bit more when you play premium slots, you’ll often find bigger jackpots in the pay table. At the other end of the scale, 10p slots can still offer significant wins. But when we rate the best slot games in the UK, we look at minimum bet, maximum bet, maximum win and the jackpot. It’s not always about how much you need to spend to win, but how much you can win.

Jackpots can range from hundreds of times your stake to many thousands of times your stake. Progressive jackpots and jackpot slots that use progressive networks can pay out life-changing sums and record prizes – some reaching millions of pounds. But is bigger always better?

When we rank new casino games, we don’t just go for the biggest progressive jackpot slots. You’ve got think about RTP, pay tables, how many symbols the game offers, bonus features and volatility. The maximum win is something else to consider. As slot games use mathematical formulas and intelligent RNG software to create winning combinations, the relationship between key variables is complicated.

Here’s how to spot the best online slot jackpots:

  • Go with minimum bet but look for the largest maximum win
  • Look for a high number of symbols on the pay table
  • Choose slot games with a good number of high value symbols
  • Bigger is sometimes better, especially with progressive jackpots
  • Pick games with more than one jackpot, often called minor, mini and major jackpots
  • Remember the rule, lower minimum stake, higher maximum win, highest RTP
  • Use online casino dashboards to find featured jackpots and progressive slots
  • Play the best online slot games to win by looking for a high number of pay lines
  • Compare our best jackpots for max win exposure

Why play the best slots online in 2021?

Our favourite bit, we’ll tell you why to play. Our 10 top most popular slot games are Slotsquad’s ultimate recommendations. But why? We would review slots in detail at one stage, write essays about gameplay, software and sound effects – spending hours trying to understand why we liked or disliked products.

Today, we’re much better at finding the best casino slots. How? Because we know the reason why.

Why is the reason we do something? It’s a much quicker way of getting to the point. So instead of 10 reasons to do something, we give you the best reason.

Every game on our list includes a “Why Play” statement. Besides the graphics, software, gameplay, bonuses and features – whatever we put here is probably the best thing about the game.

Whatever your online slot of choice, we’ll help you understand the best features in each one.

Play at the UK’s top slot sites with decent casino bonuses

We don’t know the best slot sites for winning when you play for real money – no one does. But we can tell you where to play and which brands have the most competitive casino bonuses. That’s why we feature recommended UK casinos just beneath our top-rated slots.

If you want today’s most popular bonuses and the newest games, we aim to put them together. Updated weekly by our team of players and enthusiasts, our hand-picked lineup won’t disappoint. Whether it’s free play or premium play you’re after, these online casinos for UK slot players lead the field. Compare new slots, check out the featured sites and choose the bonus that suits you most.