The Best Slots to Play Online in 2025

Eric Tanner

Betting Expert

Updated: 3 December 2024

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Slots are a staple in casinos worldwide thanks to their immersive gameplay and big win potential. Players often choose the best high RTP slots to increase their chances of winning, so our team has found the best-paying slots in the UK. Apart from making your search simpler, we’ve also explained why RTP matters and what else to look out for when picking a slot to play.

Comparing the Best Slots to Play Online for Real Money

When looking for the best slots to play online, one of the key considerations we recommend examining is the Return to Player (RTP) rate. This gives players an indication of how much they can theoretically expect to win back over time. We’ve gathered the top 10 high RTP slots in the UK below.

The Best Paying Slots Reviewed

We’ve taken the top 10 best-paying slots in the UK and provided more details about them below. Besides being high RTP slots, these games have entertaining themes and features as well as high max wins.

Book of 99 (Relax Gaming)

Created by Relax Gaming in 2021, Book of 99 remains one of the highest-paying slots today, with an RTP of 99%. This high RTP slot takes you back to ancient Egypt with lots of treasure, pharaohs, and inscriptions. Whilst playing look out for the “Book” symbol, which is the game’s wild and scatter.

Players are rewarded 10 free spins if three or more “Books” appear on the same spin. Here a symbol is randomly chosen to act as an expanding symbol, increasing your chances of a 5,000x max win. During the base game, you’ll find a collection meter. Each “Book” that appears during your gameplay is collected until you reach 99. At this point, you’ll be awarded with free spins.

Mega Joker (NetEnt)

Along with Book of 99, NetEnt’s Mega Joker is considered to be one of the best payout slots with a 99% RTP. This vintage fruit-machine game delivers a relatively easy experience with simple mechanics.

Although there are no free spins, Mega Joker features a Supermeter mode, which is triggered when a winning combination in the base game appears. Mega Joker’s ability to provide big wins with high volatility, particularly in the Supermeter mode, is what makes this game unique. It increases the potential for high returns and the overall RTP.

1429 Uncharted Seas (Thunderkick)

Thunderkick’s 1429 Uncharted Seas is one of the best slots to play in the UK thanks to its higher-than-average 98.60% RTP. Enter a nautical adventure in this five-reel game with treasures, wonky sea creatures, and mermaids. It features 25 paylines and has low volatility, making it ideal for players who prefer steady payouts.

As one of the best paying slots, 1429 Uncharted Seas offers expanding wilds that cover the entire reel to increase your chances of winning. Additionally, this high RTP slot features a free spins bonus where players can trigger 10, 20, or 50 free spins. The maximum win potential of 670x your wager is redeemable during this bonus round.

Dr Jekyll Goes Wild (Barcrest)

Dr Jekyll Goes Wild by Barcrest is an entertaining slot based on the classic tale of Dr Jekyll and Mr Hyde. The game offers an entertaining experience, featuring symbols such as potion bottles, Dr Jekyll, and his alter ego, Mr Hyde. This slot machine comes with an RTP of 98.11%, 10 winning paylines, and medium volatility.

The wild Dr Jekyll symbol, the game’s main feature, can expand across the reel and boost your odds of winning. This slot also has two Free Spin modes, where players can take advantage of additional wilds and multipliers or unlimited spins. This gives players the chance to win the €250,000 max win.

Money Cart 2 (Relax Gaming)

Following the success of the original game, Relax Gaming released Money Cart 2. This five-reel slot is a remake that eliminates the base game of its predecessor, Money Train 2, and delivers its bonus game instantly. Furthermore, the 98% RTP is surpassed by only a few slots, making the game a favourite for its high payout potential.

Landing three bonus symbols sets off the respin feature. You receive three respins and the bonus symbols stick in place. Each time a new bonus symbol appears, the spins reset to three. Additionally, if a reel is full of symbols, a new reel opens creating more room for symbols. Moreover, the multiplier symbols that appear are collected and boost your payout.

Blood Suckers (NetEnt)

Blood Suckers is a vampire-themed online slot game by NetEnt. It combines a high RTP of 97.99% with supernatural visuals, such as Dracula and vials. It features 25 winning paylines and thanks to its low volatility, it’s suitable for players who prefer more regular, although smaller, wins.

This high RTP slot offers several bonus features, including wilds, multipliers, and 10 free spins. The latter is triggered when at least three scatters appear in the same spin. During this round, players can receive a multiplier of 4x, 25x, or 100x, making the 1,016x max win more reachable.

Starmania (NextGen Gaming)

Take an interstellar adventure in NextGen Gaming’s Starmania best payout slot with stars, galaxies, and planets. The game has a high RTP of 97.86%, a jackpot of 500x your stake, and operates a pay-both-sides system. The straightforward mechanics and low volatility make it especially ideal for beginners who are learning how to play slots.

Like many other best payout slots in the UK, Starmania offers a free spins bonus round. Triggered when at least three scatters appear, three wilds appear before each spin during this round. The free spins are the best way to win big thanks to a multiplier that boosts your payouts.

Big Bad Wolf (Quickspin)

Join the Three Little Pigs and the world of fairy tales in Big Bad Wolf by Quickspin. With immersive visuals and soundtracks, the 3D slot has a series of features to enhance your gaming experience. Firstly, throughout the game, players can take advantage of a ‘Swooping Reels’ feature, which causes winning symbols to disappear and make room for new ones.

The slot’s 10 free spins are triggered by landing three scatter symbols. At the start of the bonus round, the wolf blows down the reels to reveal a new house with new symbols. During this round, the game gets more rewarding with multipliers and additional free spins. The maximum win of this highly volatile slot is 1,000x your wager.

Beware the Deep Megaways (Pragmatic Play)

Go deep underwater in the popular video slot by Pragmatic Play. With a higher-than-average RTP of 96.52%, Beware the Deep Megaways offers the potential for big wins. Thanks to the Megaways engine, the game offers dynamic reels, a tumble feature, and up to 117,649 ways to win on each spin.

Besides wilds, you’ll find mystery symbols that transform into the same random paying symbol. In addition, this high RTP slot offers two free spin options. Although different, they both reward players with multipliers and additional wilds. With a 10,000x max win, this highly volatile slot machine offers a payout that is higher than average.

Sugar Rush 1000 (Pragmatic Play)

Sugar Rush 1000 is one of Pragmatic Play’s most popular candy-themed slots thanks to its engaging gameplay and high RTP. This entertaining game uses a “cluster pays” engine instead of traditional paylines. Sugar Rush 1000 also incorporates a “Tumble” feature, where winning symbols are replaced by new ones to increase your chances of a payout.

As one of the best slots to play, this slot features multipliers throughout. These come into play when a second win appears on the same spot as a previous one. Players can also trigger free spins with multipliers, leading to a potential 25,000x max win.

Does RTP Matter?

Return to Player, or RTP, is one of the key factors players should look at when choosing a slot to play. Represented using a percentage, it shows how much the game pays back in the long run. For instance, a slot with a 97% RTP will theoretically return £97 for every £100 you wager.

A higher RTP means that the odds of winning are better, making them more enticing. Slots that have an RTP that exceeds 96% are considered to be good options as they generally give players more opportunities to win. However, it’s essential to keep in mind that the RTP is calculated over millions of spins and doesn’t guarantee the outcome of individual spins.

How to Find a Slot’s RTP

It’s important to check the game’s RTP of a game before playing to understand its payout potential. Games at top online casino sites display this information on the paytable or the ‘info’ button. Alternatively, you can find its RTP details on the developer’s website or casino gaming review sites.

RTP and RNG

Whilst RTP matters in the long run, it does not guarantee the outcomes of spins in the short term. These results are determined by the game’s Random Number Generator, or RNG. This algorithm is written into the game’s software to generate thousands of random numbers. These numbers dictate which and where the symbols land. It ensures that the results are random, fair, and not predictable.

The Pros & Cons of High RTP Slots

High RTP slots are sought-after by many players as they can be more profitable in the long term. However, there are also a few drawbacks to such games. Below, we’ve looked at the main benefits and pitfalls of slots with a high RTP.

The Difference Between RTP and Volatility in the Best Paying Slots

Volatility indicates the amount of risk you take when playing the game, whilst RTP refers to the long-term profitability of the game. Volatility (or variance) determines how frequent and how big payouts are. High, medium, and low are the three primary categories of volatility. However, you’ll find slots that are a combination of two levels.

Besides RTP, players should also check out the volatility of the slot machine to understand the risk involved. As the best payout slots can vary in volatility levels, finding one that you’re comfortable with is important.

The Best Slots to Play With High Volatility

High RTP online slots have larger wins but they occur less regularly. Therefore, the risk with high volatility slots is greater as the period between bigger wins is generally longer. Mega Joker (NetEnt), Book of 99 (Relax Gaming), and Big Bad Wolf (Quickspin) are three of the best highly volatile high RTP slots.

The Best Slots to Play With Medium Volatility

Medium volatility slots strike a balance between the size of the win and how often they come about. Such slots are less risky than those with high volatility. Dr Jekyll Goes Wild, Rainbow Riches Drops of Gold (Barcrest), and Bob: The Epic Viking Quest (NetEnt) are a few examples of high RTP and medium volatility games.

The Best Slots to Play With Low Volatility

High RTP low volatility slots feature frequent but smaller payouts. They are ideal for players who prefer a game with lower risk and more regular wins. Besides having low volatility, Blood Suckers (NetEnt) and Enchanted Garden (RTG) have an RTP of over 97.5%.

Features of The Best Paying Slots

The best slots to play often come with bonus features to increase the entertainment as well as the chances of a bigger payout. Below, we’ve explored the different features these games feature.

Wild Symbols

Wild symbols, that substitute for regular symbols to help form a winning combination, are common features in the best paying slots. Additionally, some of the best payout slots online include stacked or expanding wilds, that boost the possibility of big wins. Whilst wild symbols can be found in most slot machines, our team recommends:

• 1429 Uncharted Seas (Thunderkick) – RTP 98.60%
• Erik the Red (Relax Gaming) – RTP 96.95%
• Blood Suckers (NetEnt) – RTP 97.99%

Multipliers

Multipliers are another common feature of the best-paying slots. They can land during the base game as well as the free spins round. Any win that features a multiplier is multiplied by the number on the symbol. Examples of the best slots to play with multipliers are:

• The Dog House – Dog or Alive (Pragmatic Play) – RTP 96.52%
• Money Cart 2 (Relax Gaming) – RTP 98%
• Aztec Powernudge (Pragmatic Play) – RTP 96.46%

Free Spins

Many of the best online slots that payout include a free spins bonus feature. These are normally triggered when a specific number, usually three, of scatters or another special symbol appears. Generally, these perks offer the largest payouts. The best slots to play with free spins include:

• Blood Suckers (NetEnt) – RTP 98%
• Dead or Alive (NetEnt) – RTP 96.82%
• Marching Legion (Relax Gaming) – RTP 98.12%

Megaways

The Megaways mechanic is found in several high RTP online slots in the UK. This innovative mechanic has dynamic reels, instead of the traditional paylines. This brings about a maximum of 117,649 potential winning combinations for every spin. These best-paying slots often include cascading reels and other features that can boost your payout. Some of the best Megaways slots are:

• Blood Suckers Megaways (Red Tiger) – RTP 97.66%
• Beware the Deep (Pragmatic Play) – RTP 97.47%%
• Monopoly Megaways (Big Time Gaming) – RTP 96.50%

High Max Wins

Besides looking at a game’s RTP, players should also consider the slot’s max win. Although the chances of reaching this are relatively low, the best paying slots offer significant maximum payout potential. Therefore, practising responsible gambling is essential.

In the table below, we’ve gathered the best casino slots to play that feature high max wins.

Progressive Jackpots

Progressive jackpots are another way to go if you’re looking for the best paying slots. These games offer the chance of winning life-changing payouts that can reach the millions. Available at the top UK slot sites, the best slots to play with a progressive jackpot are:

FAQs

Resources

• https://www.tandfonline.com/doi/full/10.1080/14459795.2021.1891273#abstract

Eric Tanner

Betting Expert

Eric is an experienced casino writer who aims to deliver expert advice and honest reviews. Throughout his career, Eric has held various roles within iGaming and has gained a deeper understanding of player needs. He specialises in helping players find the best online casino games and promotions.

View all posts by Eric Tanner