Best Slot Games to Play in July 2025 

Large payouts, free spins, and innovative features are just some of the highlights you can find in the best slot games. These titles offer captivating gameplay with high RTP rates to boost your odds. Besides listing the best UK slots, we’ve explained key factors such as RTP, bonus mechanics, and volatility. We’ve also provided a selection of casino sites where you can access these games.

Top-Rated Casinos to Play Online Slot Games

Our Picks for the Best Slot Games to Play

Our team has shortlisted the top online slot machines that you can play. We’ve gathered their key features to help you compare them and choose one that matches your gaming style.

🤔 Did You Know? Since 2019, the UK Gambling Commission has banned its licensees from offering bonus buy options. Therefore, players at UK-licensed casino slot sites can’t pay to trigger bonus rounds instantly. 

The Best Online Slot Games for July 2025

We’ve reviewed our top recommended slot games and gathered key details about them, including RTP, bet limits, and bonus features.

Gonzo’s Quest Megaways

Game key points: 

Gonzo’s Quest Megaways ranks as one of the best casino slot games as it features several Megaways mechanics, including up to 117,749 ways to win.

• RTP: 96.00%
• Min Bet: £0.10
• Max Bet: £40

The slot features the Avalanche feature in the base game, where winning combinations disappear and are replaced by new ones. Consecutive wins increase the multiplier by up to 5x in the base game or up to 15x in the bonus spins feature. The game, which offers a 96.00% RTP, also features an Earthquake function. This randomly removes all low-paying symbols, allowing only high-paying ones to fill the reels.

Dead or Alive 2

Game key points: 

Released by NetEnt in 2019, Dead or Alive 2 remains a highly popular slot in the UK today thanks to its huge win potential and higher-than-average RTP, set at 96.80%.

• RTP: 96.80%
• Min Bet: £0.09
• Max Bet: £18

When five scatters appear in the base game of this Wild-West-themed game, a Scatter Win Jackpot payout awards 2,500x your bet. The main highlight is the three free spin modes, where you can choose your preferred option. Each of these comes with its own volatility and multipliers, including sticky or multiplier wilds, to boost your chances of big wins. The Train Heist Free Spins is typically the way to reach the game’s 111,111x max payout.

Book of 99

Game key points: 

Enjoy one of the highest RTP slots ever released with Book of 99 by Relax Gaming, offering straightforward gameplay with high volatility.

• RTP: 99.00%
• Min Bet: £0.10
• Max Bet: £100

This slot game is known for its 99% RTP, one of the highest available online. Three or more Book symbols trigger 10 bonus spins with a random expanding symbol that increases your win potential. The bonus spins can also be activated when you collect 99 Book symbols.

Blood Suckers

Game key points: 

Blood Suckers is a low-volatility slot with a high RTP, making it ideal for players who prefer frequent wins.

• RTP: 98.00%
• Min Bet: £0.25
• Max Bet: £50

Take a trip to a vampire lair in NetEnt’s Blood Suckers, where eerie graphics set the scene. Landing three or more Bonus symbols activates the free spins bonus game, while three stake Bonus symbols unlock the Vampire Slaying Bonus. Here, you can open coffins that carry random rewards inside. Featuring a high RTP of 98.00%, this is one of the best slot games in the UK for players who would prefer more consistent payouts.

Starburst XXXtreme

Game key points: 

Following the success of its predecessor, NetEnt released Starburst XXXtreme using the same astral and gemstone visuals. However, it comes with higher volatility and massive win potential.

• RTP: 96.45%
• Min Bet: £0.10
• Max Bet: £50

Starburst XXXtreme offers several bonus features to boost your chances of winning. These include Starburst Wilds and Random Wilds. These award players with re-spins and random multipliers with payouts of up to 150x your stake. Players can also activate the XXXtreme Spins for a larger stake, guaranteeing wild symbols on every spin. Boasting an RTP of 96.45%, the game can award a maximum win of 200,000x your bet, over €1.6 million.

Mega Moolah

Game key points: 

Set in an African jungle, Mega Moolah remains Microgaming’s most iconic progressive jackpot slot, known for awarding life-changing payouts. It entered the Guinness World Records for the largest recorded jackpot win of €17,879,645, claimed by Jon Heywood in 2015.

• RTP: 93.42%
• Min Bet: £0.25
• Max Bet: £6.25

Although Mega Moolah’s RTP is lower than average at 93.42%, it makes up for it by offering four jackpots. The most famous one, the Mega Jackpot, is typically won every eight to 12 weeks and averages at around £12 million. It’s seen as one of the best online slot games to win big, seeding at £1 million and growing rapidly as players worldwide join in. Mega Moolah has grown into a franchise with multiple progressive jackpot slots under its name, including Immortal Romance Mega Moolah.

Book of Dead

Game key points: 

Step into Ancient Egypt in one of the most popular slot games in the UK. Play’n Go’s Book of Dead is a highly volatile slot that boasts a 5,000x max win and a wide betting range.

• RTP: 96.21%
• Min Bet: £0.10
• Max Bet: £100

Join Rich Wilde in the search for hidden treasure in this higher-than-average 96.21% RTP online slot. Free spins are the game’s main bonus feature and are triggered by landing three or more Book symbols. This gives you 10 bonus spins with a random symbol that expands to cover the whole reel when it lands on a winning payline.

Big Bass Bonanza

Game key points: 

Built around a colourful fishing theme, it’s ideal for both casual players and high rollers thanks to its wide betting range. It is a notable favourite among UK gamers, and its success has resulted in a series of sequels.

• RTP: 96.71%
• Min Bet: £0.10
• Max Bet: £250

Featuring an RTP of 96.71%, Big Bass Bonanza is one of the best paying slot games by Pragmatic Play. The slot game’s bonus round is activated when three or more scatters appear, awarding 10, 15, or 20 bonus spins. During this round, a fisherman wild symbol is introduced and substitutes for any standard symbols to form a winning line. Additionally, if any fish symbols land on the same spin as the fisherman, he collects all their cash values.

Jammin’ Jars

Game key points: 

Jammin’ Jars is a lively fruit-themed slot by Push Gaming that uses Roaming and Sticky Wilds, plus cluster pays instead of the traditional paylines.

• RTP: 96.83%
• Min Bet: £0.20
• Max Bet: £100

Wins form when a minimum of five matching symbols land next to each other. This triggers the Collapse feature, where the winning symbols disappear and are replaced by new ones, allowing additional wins from a single spin. Jammin’ Jars features a 96.83% RTP and offers free spins as well as a Rainbow Feature that adds one or more Giant Fruit Symbols. These transform all covered positions into matching symbols for bigger wins.

Vikings Go Berzerk

Game key points: 

Vikings Go Berzerk is a Nordic-themed online slot by Yggdrasil. Its volatility is set to medium, so it strikes a balance between regular wins and rewarding payouts.

• RTP: 96.10%
• Min Bet: £0.25
• Max Bet: £125

This slot game features random treasure chests that award prizes like multipliers, additional free spins, cash prizes, and sticky wilds. You can also unlock the free spins round by landing three or more scatters. Here, you’ll find additional modifiers, such as wild reels. Below the reels, a meter collects Viking Rage symbols until all Vikings go berserk and result in Sticky Wilds.

Top Casinos for The Best Paying Slot Games Reviewed

We’ve compared the best online slot sites in the UK. Our team assessed how they scored across several key areas, including slot variety, average RTP, and welcome bonus.

Popular Slot Themes

From ancient Egypt to hit TV programmes to modern adventures, online slots come in thousands of themes to suit the tastes of most players. The best casino slot games include innovative features, plus outstanding graphics and sound. We’ve gathered the most popular themes in the UK.

🏺Ancient Egypt Slots

Thanks to its powerful imagery, golden pharaohs, pyramid symbols, and sense of mystery, this theme is a favourite among UK players. The best paying slot games in the UK with an Ancient Egypt theme are:

• Sanctuary (Big Time Gaming): RTP 96.38%
• Hand of Anubis (Hacksaw): RTP 96.24%
• Cleopatra (IGT): RTP 95.02%

🤠 Wild West Slots

Packed with action and big win potential, Wild West-themed slot games remain a popular choice for players. In the list below, we’ve gathered the best slot games to win money that bring this theme to life using multiple bonus features.

• Dead or Alive 2 (NetEnt): RTP 96.80%
• Money Train 2 (Relax Gaming): RTP 96.40
• Duel at Dawn (Hacksaw): RTP 96.30%

📖 ‘Book Of’ Slots

The ‘Book Of’ online slots series has become one of the most popular categories at online casinos. In most of these online slots, you’ll find ancient book symbols and bonus spins with expanding symbols that cover entire reels. You can enjoy these and several other titles in this theme at the best online slot sites.

• Book of Dead (Play’n Go): RTP 96.21%
• Book of Ra Deluxe (Novomatic): RTP 95.01%
• Legacy of Dead (Play’n Go): RTP 96.58%

🧝 Mythology Slots

Centred around Greek, Norse, Aztec, and Egyptian myths, mythology-themed slots bring ancient legends to life. These online slots are known for immersive visuals and bonus mechanics that are influenced by each culture’s history. Here are some of the most sought-after mythology titles found at UK online slot sites.

• Age of the Gods (Playtech): 95.02%
• Thunderstruck 2 (Microgaming): RTP 96.65%
• Vikings Go Berzerk (Yggdrasil): RTP: 96.10%

🐾 Animal Slots

Animal-themed slots are typically the most versatile type of slot, taking players to farmyards, jungles, or underwater. At the top-rated UK casinos, you’ll find a wide selection of titles from wild predators to farm animals to fluffy pets. Whether you enjoy jackpots or innovative video slots, we’ve rounded up a mix of the best slot games in the UK with an animal theme.

• Mega Moolah (Microgaming): RTP 93.42%
• The Dog House Megaways (Pragmatic Play): RTP 96.55%
• White Rabbit Megaways (Big Time Gaming): RTP 97.24%

Common UK Slots Features

The best casino slot games share similar features that determine how the game is played and how it pays. Wild symbols that complete paylines or scatter symbols that unlock bonuses are present in thousands of online slot machines. Learning about the main slot mechanics can help you understand how these games work.

Wild Symbols

Wild symbols are the most common slot feature and substitute for standard symbols to help you complete winning combinations. Present in both the base game and bonus rounds, wild symbols are beneficial to increase your chances of winning.

🤔 Did You Know? Although wilds typically substitute for regular symbols, they don’t always behave in the same way. Stacked wilds can cover entire reels, and roaming wilds shift positions across the grid over several spins. Meanwhile, sticky wilds stay locked in place during bonus rounds to increase your win potential. 

Multipliers

Multipliers increase the value of a win by applying a set factor, such as 2x, 5x, or more. They are present during the base game or bonus rounds and often work with slot features like wilds, cascading reels, and free spins. To create larger payout potential, some online slots include progressive multipliers that grow with each win, while others include unlimited multipliers.

Scatter Symbols

Scatters generally unlock free spins or bonus games. Unlike regular symbols, scatters do not need to land on a payline to count. Instead, landing enough of them anywhere on the grid activates the game’s bonus feature. The best paying slot games often apply multipliers or random cash payouts to scatter symbols, boosting your chances of receiving a bigger win.

Bonus Games & Rounds

From bonus spins to cash payouts to multi-level games, the biggest wins generally happen in the bonus rounds of an online slot. Free spins are typically the most common bonus feature and are typically triggered when at least three scatter symbols appear on the same spin. They give you a way to increase your payout without needing to place any additional bets.

🤔 Did You Know? Many bonus games include multipliers, sticky wilds, or higher-value symbols that can significantly increase your payout. 

Cascading Reels/Tumbles

A cascading reel mechanism is a modern feature found in many online slots. Whenever a winning combination lands, the winning symbols disappear, by cascading or tumbling from the reels, and new ones take their place. This creates the chance for additional wins from the same spin.

Respins

Some slots feature respins that give players an additional spin for free when particular symbols land. They’re also used as a second-chance mechanic after a near-win. Many games combine this with features like sticky wilds or locked reels to increase your odds of winning.

Slots Volatility and RTPs

Knowing how volatility and RTP (Return to Player) work is useful when playing slots online. RTP gives you a theoretical percentage of how much you can win back over time. For instance, a slot with a 97% RTP should, on average, return £97 for every £100 wagered. The best online slot games to win have an RTP of over 96%.

Volatility, or variance, describes how frequently and how much a slot tends to pay out. It is generally classified into five levels, ranging from low to high. Highly volatile slots pay less frequently, but the wins have the potential to be larger. Low volatility online slots pay out more regularly; however, the value of the wins is smaller. Medium volatility slots strike a balance between the two.

It’s important to remember that volatility and RTP are separate aspects of casino games. For example, low-volatility online slots suit players who prefer a lower-risk experience and want to extend their gameplay plus bankroll. In addition, the return to player is based on thousands or millions of rounds, so it is less likely to materialise when you play a few spins.

Popular Slot Types

Although all slots are based on spinning the reels to create winning combinations, there are several types, each offering gameplay mechanics and features. Here are some of the most popular formats you’ll find at the top slot sites on our list.

Classic Slots

Based on the traditional form you would find in land-based casinos, standard slot games offer a simple gameplay. They generally have three reels, with only one to three winning paylines. Symbols generally include sevens, bars, or fruits. Our team recommends Mega Joker (NetEnt) and Emerald Diamond (Red Tiger), two of the best online slot games to win in the UK for fans of classic slots.

Video Slots

Video slots are the most common type of slot machine. They typically have five reels and come with between 10 and 100+ paylines. Besides a more immersive experience with high-quality themes, graphics, and sounds, they offer features such as wilds and scatters as well as bonus rounds. Examples of the best UK slots include Big Bass Splash (Pragmatic Play) and Fishin’ Frenzy: The Big Catch (Blueprint Gaming).

Megaways

Created by Big Time Gaming, Megaways slots were a massive hit when they launched. They use a dynamic reel modifier that changes how many symbols show on each spin. Unlike video slots that have a fixed number of paylines, Megaways slots offer up to 117,649+ winning combinations every time you spin the reels. They often include features such as cascading reels, multipliers, and free spins.

You’ll find titles using this mechanic at most online casinos, including non-Gamstop Megaways slot sites. The best paying slot games in the UK include White Rabbit Megaways and Rasputin Megaways (Big Time Gaming).

Progressive Slots

Some of the biggest wins at online casinos come from progressive jackpot slots. Each time a player stakes on these games, a small part of that bet goes towards the jackpot. This continues to grow until a lucky winner hits the pot. Progressives like the Mega Moolah (Microgaming), Jackpot King (Blueprint Gaming), and Age of the Gods (Playtech) series have delivered seven-figure payouts.

Cluster Pays Slots

Rather than using fixed paylines, cluster pay slots create wins when a number of identical symbols touch each other horizontally or vertically. Available at UK as well as non-Gamstop casinos, examples of the best UK slots with this mechanic include Jammin’ Jars (Push Gaming), The Border (Nolimit City), and Cluster Tumble (Relax Gaming).

Best Slot Game Software Providers

The gaming studios that power the games at the slot sites frequently determine how good and reliable your experience will be. Leading providers produce high-quality games that have been tested for fairness by third-party labs.

NetEnt

Along with iconic titles such as Starburst and Gonzo’s Quest, NetEnt has produced over 200 games. Its portfolio includes classic real money slots, jackpots, and video games, including branded online slots. It has won multiple iGaming awards over the years, including Slot Provider of the Year and Game of the Year for its Guns N’ Roses slot. Popular NetEnt titles include:

• Starburst
• Dead or Alive 2
• Hall of Gods

Pragmatic Play

Pragmatic Play is known for its choice of games, several of which frequently appear in the UK’s top 10 slot charts. It’s a top provider for many UK players who play slots online, thanks to its feature-rich gameplay and high RTP rates. In addition, the studio maintains a consistent lineup of new releases to keep its portfolio diverse. Examples of the leading three Pragmatic Play real money slots are:

• Big Bass Splash
• Sweet Bonanza
• Buffalo King Megaways

Microgaming

Established in 1994, Microgaming was one of the first slot creators and has since then produced more than 800 games. Although it’s mostly known for its progressive jackpots, its collection offers a wide range of games to appeal to a broad spectrum of gamers. You can find these and other new releases at UK Microgaming online casinos. Standout titles from this provider are:

• Mega Moolah
• Immortal Romance
• 9 Pots of Gold

Finding the Right Slot Game for You

Choosing a slot game that matches your gaming preferences can be tricky. Our team has created a list to help you decide which ones are right for you.

✅Play in demo mode first – Explore the best free slot games to get a first-hand experience on how the game works. Several platforms, especially top-rated new slot sites, let you test their virtual gaming library in free mode. This allows you to learn how to claim free spins plus other bonus features, themes, and mechanics before placing a real-money bet.

✅Match slots to your playing style – Choose a volatility that aligns with your preferences. Go for low volatility games if you prefer more regular, although smaller, wins. On the other hand, highly volatile slot machines can return bigger payouts, but they come about less frequently. Trying out the slot in demo mode can help you understand which volatility you enjoy the most.

✅Find games with a high RTP – Although RTP does not guarantee the outcomes of individual spins, higher RTP games theoretically pay back more in the long term. The best online slot games to win money feature a return of over 96%.

✅Look out for the game’s themes and features- The theme, graphics, and soundtracks of the slot help to create a more enjoyable experience. From mythology to adventure to branded titles and non Gamstop Fluffy Favourites slots, finding a theme you enjoy is key. In addition, the best slot games offer several features to keep the game interesting, like cluster pays, cascading reels, multipliers, and jackpots.

✅Choose a reputable casino – Ensure that the online casino is licensed and regulated by the UK Gambling Commission or other reputable offshore authorities. These slots sites are held to high standards and offer secure payments, responsible gambling tools, as well as fair games.

Summary

Understanding key aspects, like RTP, volatility, mechanics, and bonus features, is useful when finding the best slot games. To help you decide, we’ve reviewed the top 10 slots in the UK. The list includes the best payout slots by trusted developers and features a variety of themes and slot types, from classics to progressive jackpots to Megaways titles.

FAQs

Which are the best slot games to play?

Games with a high RTP are generally considered to be the best option. Top-rated titles include Marching Legions, Blood Suckers Megaways, and Book of Dead. However, it’s important to find a slot that you enjoy by examining its bonus features, themes, and mechanics.

What slot is more likely to win?

The best payout slots feature an RTP (Return to Player) that exceeds 96% as they provide better chances of winning in the long term.

How do I find a slot’s RTP?

This information is usually available in the game’s paytable or Info section. Otherwise, you can find it online in slot reviews.

Can I play slots for free and win real money?

Yes, under certain circumstances. If you’re playing the slot in demo mode, any payouts are imaginary. To win real money, you must find no deposit casino bonuses where you can play the eligible slot titles for free. You can still win real money in such cases. However, these promotions can come with bonus wagering requirements that you must fulfill first.

Where can I play slots online?

You can play online slots at any of the slot sites we feature in our guide, including 888casino, William Hill, and Highbet. These platforms are licensed and regulated by the UK and offer hundreds of the best online slot games in their portfolio.

Resources

• https://www.gamblingcommission.gov.uk/news/article/games-warning-for-online-operators
• https://www.guinnessworldrecords.com/world-records/largest-jackpot-payout-in-an-online-slot-machine-game
• https://www.tandfonline.com/doi/full/10.1080/14459795.2021.1891273#d1e505