Best Online Slot Games in UK

There are thousands of UK slots online, covering dozens of different themes, and containing lots of different gameplay mechanics and bonus games. For seasoned players, finding the best online slots is easy. But for new players that have just started playing slot games, choosing a slot site and a game to play can be confusing. Many casinos claim to be the leading UK slot game provider. This makes filtering the best ones time-consuming.

At Gambling Zone, we want to simplify things for you. We believe that finding and playing an online slot should not be a complicated process. Our team of experts have researched and compiled everything you need to know about slot games from key terms, recommended games, paylines, bonus features, to FAQs. Gambling Zone provides unbiased reviews to help you find the site that suits you best.

To learn more about how we review slot games please check our Game Review Criteria page.

Mega Don Feeding Frenzy

Mega Don Feeding Frenzy

Game Provider

Play'n GO

Themes

Animals

RTP

96.20% (varies)

Paylines

1,024

Bet Amount

£0.10 to £100

Max Win

Up to 20,000x
7.5 / 10
Candy Jar Clusters

Candy Jar Clusters

Game Provider

Pragmatic Play

Themes

Candy

RTP

96.08% (varies)

Paylines

Cluster pays

Bet Amount

£0.20 to £240

Max Win

Up to 10,000x
7.5 / 10
Pug Life

Pug Life

Game Provider

Hacksaw Gaming

Themes

Animals

RTP

96.33% (varies)

Paylines

16

Bet Amount

£0.10 to £100

Max Win

Up to 7500x
8.5 / 10
Sword of Ares

Sword of Ares

Game Provider

NetEnt

Themes

Greek

RTP

96.4% (varies)

Paylines

Pay Anywhere

Bet Amount

£0.20 to £100

Max Win

Up to 10,000x
8 / 10
Book of Golden Sands

Book of Golden Sands

Game Provider

Pragmatic Play

Themes

Egyptian

RTP

96.46% (varies)

Paylines

729

Bet Amount

£0.20 to £100

Max Win

Up to 10,000x
7 / 10
Aztec Spell

Aztec Spell

Game Provider

Spinomenal

Themes

Aztec

RTP

96.63% (varies)

Paylines

45

Bet Amount

£0.50 to £500

Max Win

Up to 1,000x
8 / 10
Pop

Pop

Game Provider

Big Time Gaming

Themes

Circus

RTP

96.54% (varies)

Paylines

256 ways

Bet Amount

£0.10 to £5

Max Win

Up to 66,960x
7.5 / 10
Wisdom of Athena

Wisdom of Athena

Game Provider

Pragmatic Play

Themes

Greek

RTP

96.07% (varies)

Paylines

Pay Anywhere

Bet Amount

£0.10 to £100

Max Win

Up to 5,000x
8 / 10
Spaceman

Spaceman

Game Provider

Pragmatic Play

Themes

Space

RTP

95% (varies)

Paylines

Cluster Pays

Bet Amount

£1.00 to £100

Max Win

Up to 5,000x
7 / 10
Hellapenos

Hellapenos

Game Provider

Thunderkick

Themes

Animals

RTP

96.19% (varies)

Paylines

100 ways

Bet Amount

£0.10 to £100

Max Win

Up to 5,000x
8 / 10

Online Slots RTP (Return To Player) 

Players who want to try a game of chance must first learn what RTP is. The RTP or Return To Player in slots shows how much a player earns from the bets they make in a slots casino. Every game’s RTP is expressed in percentages. It is also important to note that this is a theoretical number which has been created after a game provider plays millions of test spins. Theoretically games with a higher RTP should give more returns. However, it does not mean you will automatically win. One other important factor to note is that providers give information based on the base RTP but they create versions of the same game with different RTPs and let casino sites choose which version to use. However, the casinos need to state which RTP version they are using on their site.

Top Online Slot Games

The Gambling Zone experts have selected the most popular slot games available in the UK at the moment.

Logo for the slot game Big Bass Bonanza

Big Bass Bonanza
Slot RTP: 96.71%

This fishing-themed online slot, Big Bass Bonanza, is one of Pragmatic Play’s in-demand games. Aside from its high RTP, it is highly volatile too. Watch the action happen in 5 reels, 3 rows, and 10 paylines. The stakes level of this game ranges from 10p to £250 per spin.

Logo for the slot game Fishin Frenzy

Fishin' Frenzy
Slot RTP: 96.12%

Fishin' Frenzy slot offers 5 reels, 3 rows, and 10 lines. The stake range of this game is 10p to £80 per spin. Try your luck underwater and catch the biggest prizes. You can get up to 5000x your total stake.

Logo for the slot game Sugar Rush

Sugar Rush
Slot RTP: 96.5%

Sweet surprises await you at Sugar Rush. This candy-themed game is played on a 7x7 grid reel. With unlimited free spins and multipliers up to 128x, you can get a maximum win of 5000x your stake.

Logo for the slot game Cleopatra

Cleopatra
Slot RTP: 95.02%

This classic slot, Cleopatra, takes you back to Ancient Egypt. It has 5 reels and 20 paylines. Due to its popularity in land-based casinos, developers have made it available for play in online casinos too. It is playable with 20p to £600 per spin.

Logo for the slot game Fluffy Favourites

Fluffy Favourites
Slot RTP: 95.39%

This animal-themed slot, Fluffy Favourites, has 5 reels, 3 rows, and 25 paylines. The symbols feature stuffed animals from a carnival game. To win, match 3 symbols of the same kind on adjacent reels. What's more, this iconic game boasts a Free Games feature.

Logo for the slot game Starburst

Starburst
Slot RTP: 96.09%

Journey towards outer space with NetEnt's Starburst 5-reel video slot. There is a Starburst Wild feature that can appear in reels 2, 3, and 4. This feature can give you free re-spins that make it possible for players to get the maximum win.

logo for the slot game sweet bonanza

Sweet Bonanza
Slot RTP: 96.49%

Sweet Bonanza slot is played in a 6-reel with an All Ways payline. It has 3 bonus features: Tumbler features, Ante Bet feature, and the Free Spins feature. Activate the Free Spins with the rainbow bomb to boost winnings up to 100x.

Logo for the slot game Book of Dead

Book of Dead
Slot RTP: 96.2%

Sweet Bonanza slot is played in a 6-reel with an All Ways payline. It has 3 bonus features: Tumbler features, Ante Bet feature, and the Free Spins feature. Activate the Free Spins with the rainbow bomb to boost winnings up to 100x.

Logo for the slot game Slingo Rainbow Riches

Slingo Rainbow Riches
Slot RTP: 95%

This Irish Luck-themed game, Slingo Rainbow Riches, by Barcrest has 5 reels and 20 paylines. Play this game from 20p to £500 per spin and get the chance to win up to 500x your total stake. It has 3 bonus features that can give your betting experience worthwhile.

Play Slot Games at the Best Online Slot Sites

Every player wants to join casino sites that offer exciting games. But the challenge remains: how do you know it is the best? We have compiled a list of the best online slot sites for you.

Spin Genie

108 Free Spins

PlayOJO

50 Wager Free spins

Genting Casino

Get 132 Free Spins
on Big Bass Bonanza

Swift Casino

100% Bonus up to £50
+ 50 Free Spins

Yako Casino

100% up to £99
+ 99 Free Spins
on Book of Dead

Types of Online Slot Games

Some players prefer simple games, while others want more advanced games. Virtual slots give casino enthusiasts a whole level of excitement. What makes them exciting is they vary in theme, objective, and prizes. Here is a quick breakdown of the main different types of online slot games that players can enjoy.

Megaways Slots

Created by Big Time Gaming, Megaways is a game mechanic that comes with attractive features. This online slot uses up to 6 reels and has no predetermined paylines. The goal is to match symbols on adjacent reels. Players should expect to see changes in the number of symbols for every spin.

Jackpot Slots

Every player has that ultimate goal: To win that life-changing jackpot! The odds may be long, but you are guaranteed huge winnings on top of standard prizes. Below are two types of jackpot slots.

Progressive Jackpots

Similar to how the lottery works, the pot money in progressive jackpots increases every time no one hits the jackpot. When somebody wins the jackpot, the jackpot amount reverts to its initial amount. This amount grows whenever a qualifying bet is placed, and it stacks up until someone wins.

Daily Jackpot Slots

If you are interested in bagging big wins on a daily basis, grab the opportunity and try out the daily jackpot slots online UK. The pot prize value of daily jackpot slots increases every time bettors place a qualifying wager. Remember, these promotional prize pots can be won once every day.

Slingo Games

With Slingo games, players get the best of both worlds — for the game itself is a combination of slots and bingo. Slingo games feature high-quality visuals and captivating sound effects borrowing mechanics both from slot games and from bingo.

Traditional Slot Machines

An image of an old slot machine that is operated with a side lever

Traditional slot machines have a lot of the same mechanics as online slot games but the terminology is slightly different. We will go over some of the important terms below and explain what each means.

Multi-coin/Multi-line

These slot machines work similarly to online slot games in that they allow players to choose how many paylines to play on and how many coins to bet on each payline. If you choose to deactivate paylines you will spend less money however your chances of getting a winning combination also decrease. Once you activate multiple paylines your bet per spin will increase but you will have higher chances of getting a winning combination. It is important to note that you are not increasing the win amount, you are just increasing the frequency.

Buy-a-Pays/ Hidden Buy-a-Pays

A Buy-a-Pays slot machine changes the number of winning combinations and symbols based on your stake. This means if the machine has, for example, fruit symbols, bar symbols, and lucky 7 symbols, you would need to bet three coins in order to unlock all three symbols as winning combinations. Unless you are prepared to place max bets on each spin, do not play Buy-a-Pays slot machines. A hidden buy-a-pays machine refers to a slot game in which the bonus feature will only trigger if you place the max bet.

Straight Multiplier

A straight multiplayer is a type of slot machine that allows players to multiply their win amount by the number of coins they bet. For example, if you bet one coin, all paylines and combinations are available but the win amount will be at the base level. If you bet two coins, all the paylines and combinations remain the same, but the win amount is doubled.

Combination Slots

This traditional slot is a combination of the other types. They are also called Hybrid slots. The slot could be a Multi-coin and a Buy-a-Pay, or Hidden Buy-a-Pay and a Straight Multiplayer.

What are Slot Reels?

An infographic showing examples of a three reel slot game, 5 reel slot game, 7 reel slot game and cascading reels

Slot reels are a major component of slot machines. These are positioned vertically on the grid with different symbols on each reel. After placing a wager, the reels spin. After the spin stops a win is triggered if there is a winning combination on an active payline.

Types of Slot Reels

There are many different types of slot reels especially with the thousands of video slot games available nowadays. Here are some of the most prevalent types of slot reels in online slot games.

Three-Reel Slots

Three-reel slots are most commonly associated with classic slot games. These are usually the simplest type of slot game with a 3x3 grid layout. On the most basic versions of the three-reel slot games only the middle payline is active. However, more contemporary three-reel games play around with this and provide more paylines and other features to make the games more interesting for new players.

Five-Reel Slots

Five-reel slots are currently the most common type of online slot game setup. The grid layout is usually 5x3 and if you take a look at most of the slot reviews on Gambling Zone, you will quickly see that most slot games fall under this category. The most popular games are most often 5-reel slots as well. These slot games also offer a lot more flexibility in terms of how many paylines are available, but the most common configurations are 10 or 20 active paylines.

Seven-Reel Slots

Seven-reel slots add an extra level of complexity to the online slot game and give a lot more winning combinations and game mechanics. Megaways slots are also in this category. The number of paylines and winning combinations increase to the thousands in these games. There are also certain slot games where the number of reels change depending on whether you are playing the base game or one of the bonus games.

Cascade Reel Slots

The final type of slot reel layout which is important to mention is the cascade reel. This also has a number of alternate names such as tumbling reels, or pay anywhere reels. These reels can have any number of grid layouts from a traditional 5x3 layout or a 10x10 layout. What makes these reels different is that when you trigger a winning combination the winning symbols disappear and more symbols fall from above to replace them. This is the cascade or tumble. Once the new symbols fall into place more winning combinations can trigger on the same spin. Pay Anywhere slots function the same way but instead of working with paylines the wins trigger if you have enough symbols clustered next to each other.

Online Slot Paylines

Ten examples of different slot paylines

The online slot paylines are lines that determine the winnings based on the combinations. These may appear as different patterns on the reels. You may see combinations on straight, diagonal, and even zigzag lines. You will only trigger a win for the paylines that you have placed a bet on.

Bonus Features in Online Slots

In classic three-reel slot games there were not many different ways to win while playing the game. Nowadays, slot games are full of different features and bonus games. In order to trigger these bonus games and features you need to either get a winning combination, get a certain type of symbol on the reels, or they can trigger randomly. Here are some of the most common bonus games you can find on an online slot.

  • Free Spins: You will get a certain number of spins without having to wager
  • Jackpot: You can win a set amount of money depending on the jackpot amount
  • Gamble: You can play a mini game to increase your winning amount
  • Respin: The reels continue to spin as long as you get wins
  • Bonus Buy: You can spend money to play a bonus game

New Online Slots

We regularly check the latest slots released by the leading game providers. Our experts test them out to give you an honest review based on first-hand experience. By doing so, we can provide you with our insight if the slot game is worth trying or not. Here are the latest slot games released in the UK.

Pirates Party

Game Provider

NetEnt
Learn More

Themes

Pirate

Paylines

243

Invaders Takeover

Game Provider

Light and Wonder
Learn More

Themes

Space

Paylines

4,096

Year of the Dragon King

Game Provider

Pragmatic Play
Learn More

Themes

Asian

Paylines

20

Jelly Belly Megaways

Game Provider

NetEnt
Learn More

Themes

Candy

Paylines

117,649

12 Bolts of Thunder

Game Provider

Thunderkick
Learn More

Themes

Viking

Paylines

20

Free Spins in Online Slot Games

The most popular bonus feature in a slot game is free spins. Casino enthusiasts find free spins an attractive bonus as it increases the possibility of getting higher payouts. This type of bonus can be used as an advantage by both new and existing players. In the UK, there are free spins that come with no deposit bonuses and free spins that are not restricted by wagering requirements.

Bonanza Megaways

Game Provider

Big Time Gaming
Learn More

Themes

Mining

Paylines

117,649

Cat Wilde and the Doom of Dead

Game Provider

Play'n GO
Learn More

Themes

Egyptian

Paylines

10

Jammin' Jars

Game Provider

Push Gaming
Learn More

Themes

Fruit

Paylines

Cluster Pays

Online Slot Themes

Although it pays to have great bonus features in your chosen slot site, their games must be visually appealing as well. Slot providers create unique themes for easy recall. Storytelling increases player engagement as it gives players something to relate to. Some of the most popular themes to date are based on mythology, films, TV shows, sweets, and others.

A blue Ankh that symbolize the Egyptian theme for slot games

Egyptian

2 blue cherries that symbolize the Fruit theme for slot games

Fruit

A blue four leaf clover that symbolize the Irish theme for slot games

Irish

A blue TV box that symbolize the TV Show theme for slot games

TV Show

Leading Software Providers of Online Slots

The online gaming world is loaded with game developers whose aim is to satisfy the demands of every player. The best developers are the ones that can stimulate excitement with the use of innovation. These three top our list:

NetEnt

Providing a great selection of games since 1996, NetEnt is considered by game developers as the standard when it comes to online gaming. In 2019, NetEnt was responsible for creating more than 58 billion game transactions. They have more than 200 engaging slots that come with striking features.

Yggdrasil

Known for their one-of-a-kind casino slots and lottery products is software provider Yggdrasil. This provider only joined the gaming scene in 2013, but it has already made its mark in the industry. With exceptional technological feats, they have secured their position among the best game providers.

PlayTech

One of the leading online gaming developers in the UK is PlayTech. Since its birth in 1999, it has given players a shot at winning enormous prizes. They have created iconic slots that are based on films such as Gladiator, RoboCop, and Ace Ventura.

Play Online Slot Games in Mobile

Today, most people spend a lot of time on their mobile phones. Therefore, game suppliers must see to it that their games can be played on different platforms. Slots should be available for play on different platforms including smartphones. In addition, they must be compatible with various operating systems.

Online Slots FAQ

Here are some of the commonly asked questions about slot games:

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