Discover the best 99% RTP slots you can play in the UK. On this page, we bring you the most exciting 99% RTP slots ranked and reviewed by our expert team.
RTP, meaning Return To Player, indicates the payout percentage the slot is going to pay back to the players over a long period of time. 99% RTP is the best there is, but also very few games have this high percentage.
We have gathered a list of the best 99% RTP slots you can play for real money. Our expert team has tested the games and picked the finest for you to try out. We have also included titles that used to be available for UK players but have been removed from UK casinos for various reasons.
The best 99% RTP slots are listed in the table below:
| Rank | Name | RTP | Max Win | Where to Play |
|---|---|---|---|---|
| 1. | Mega Joker | 99.00% | 2,000x | Play at Videoslots |
| 2. | Book of 99 | 99.00% | 12,075x | Play at Pokertars |
| 3. | Ugga Bugga | 99.07% | N/A | - |
| 4. | Ooh Aah Dracula | 99.00% | N/A | - |
| 5. | Monopoly Big Event | 99.00% | 250,000x | - |
The best 99% RTP slot is Mega Joker.
Mega Joker is a classic slot game made by NetEnt. It looks like an old-school slot machine with symbols like lemons, cherries, and jokers.
The game has two modes: the regular base game and the Supermeter mode, where the RTP can go up to 99%.
The game is very simple to play but offers a bit of depth for players who want to learn how the Supermeter works. In this mode, winnings from the base game can be used to spin for bigger prizes.
The top jackpot is progressive, which means it can grow really large over time and be triggered at any spin.
Book of 99 is an ancient Greece-themed slot from Relax Gaming. The game has a clean 5-reel slot design with heroes, monsters, and golden books as symbols, and it offers both wilds and scatter features.
The layout is a bit outdated and might feel boring, but the Book of 99 RTP makes it worth trying out.
When you collect 99 book symbols or get three on a spin, you unlock free spins with a special expanding symbol.
The game is easy to understand. It has good potential payouts, so many players like it because they get more value for their money.
Over the years, some of the highest RTP slots - those offering payout rates of 99% or more - have quietly disappeared from UK online casinos. These games were once popular for giving players better long-term value and offering exciting features. However, changes in licensing, regulatory updates, and technical limitations have led to their removal from UK-licensed sites.
Here's a look at three of the most notable titles that are no longer available in the UK but are still talked about for their generous payouts.
Ugga Bugga is one of the most iconic and unusual slot machines that used to be found at Playtech casinos. Unlike typical slots, it features a 3x1 layout repeated in three sets across the screen, allowing players to hold symbols, like in a poker machine.
The game uses tribal-themed symbols and offers low volatility. Its 99.07% return rate makes it one of the best-paying slots ever made.
However, mastering it requires some knowledge of which symbols to hold and when to spin.
While it's no longer available in the UK, it remains a legend among high-RTP seekers and veteran slot fans.
Ooh Aah Dracula is a quirky vampire-themed slot developed by Barcrest. It has a lighthearted and cartoonish style with bats, hearts, and spooky castles filling the reels.
One of its key attractions is the High Roller Mode, where players can activate extra features and significantly boost the RTP to 99%.
The game includes several bonus rounds, such as the Graveyard Bonus and Heart Attack Bonus. Regular and super free spins add extra excitement to each session.
Although it's no longer offered on UK-licensed casinos, Ooh Aah Dracula still has a loyal fanbase and is fondly remembered for its unique mix of humour, strategy, and high payout potential when played in the right mode.
Monopoly Big Event by Barcrest is a branded slot based on the classic board game. It offers both regular and "Big Bet" modes - the latter being where the RTP reaches up to 99%.
In this mode, players pay more per spin but unlock added benefits like persistent wilds and guaranteed bonuses.
The game has great variety, featuring stacked symbols, locked wilds, and the Big Event bonus round, where players can earn free spins and multipliers.
Though no longer found in UK-licensed casinos, being part of the Monopoly slots, the game still admired for its unique gameplay, nostalgic appeal, and generous payout potential when played in the right setting.
If you're looking for slot sites with 99% slots, you're likely aiming for the best possible value when playing online. These kinds of games have a very high RTP, meaning they're designed to give more money back to players over time. While many 99% RTP slots have been discontinued or are harder to find - especially in the UK - you can still find top-rated casinos that offer the best chances with similar high-paying games.
Below, we've listed some of the best online slot sites that stand out for fair gameplay, strong reputations, and a good mix of classic and modern slots. These casinos are fully licensed, easy to use, and often include useful features like low deposit options, welcoming bonuses, and helpful customer support.
| 1st deposit bonus | 100%/£100 + 50 bonus spins |
|---|---|
| No deposit bonus | - |
| Bonus code | |
| Number of slots | 4500 |
| Minimum deposit | £10 |
Casumo has established a reputation for its adventurous spirit. They have successfully scooped up awards for innovation, mobile operations and as a casino operator. In 2015, ... Casumo casino review »
99% slots are online slot games with a very high Return to Player (RTP) rate - specifically 99%. This means that, over time, the game is designed to give back 99% of all money wagered to players, keeping only 1% for the casino. These slots offer better chances than most, as the average RTP for regular slots is usually between 94% and 96%.
While many 99% RTP slots are no longer available in the UK, players still search for slots with a higher RTP to get more value from their play. These games don't guarantee wins, but they give players a fairer shot over the long run.
RTP stands for "Return to Player." It shows how much money a slot game is expected to pay back to players over time. For example, a slot with 96% RTP gives back £96 for every £100 wagered, on average.
It doesn't guarantee results in one session, but it's a helpful way to compare how much the game pays back in time - especially when looking for the highest RTP slot available.
You can usually find the RTP in the game's info or help section, which is marked as a percentage. Some casinos also list it on the game's thumbnail or description page.
For example, when you click on the "?" button on the Mega Joker slot, it will open the game rules, and you can find information about the Return to Player rates.
If the RTP is not visible in the game or the casino, a quick search online with the slot's name and "RTP" often brings up the answer.
For several years, UK-licensed casino sites have not released any new slot games with a 99% RTP. Slots with such a high payout rate are rare today because most developers and casinos prefer games with lower RTPs that offer more volatility and profit margin. The strict UK regulations may also limit the release of extremely high-RTP slots.
If you're looking to play these titles, check out a UK new casino that offers a wide variety of high-RTP games and clear game information. While you may not find many newly launched 99% slots, some of the latest UK casinos do offer generous bonuses and interesting slots that are worth exploring.
Although 99% RTP slots already give you excellent value, pairing them with the right bonus - like free spins or a deposit match - can boost your chances of winning without spending as much.
Whether you're a new player or switching sites, there are many slots welcome bonuses that can help you get started on the right foot.
Here's a look at the most common types of bonuses you might find for these games.
Free spins let you play selected slot games without using your own money. They're often given on popular titles and may occasionally be available on high RTP slots like Book of 99. You get a set number of spins, and any winnings are usually subject to wagering rules. Look for free spins on registration UK deals that don't require a deposit to try out some games for free.
These bonuses are perfect for testing games or getting extra playtime. Just keep in mind that many free spin offers are limited to specific games, so always check if they apply to the high RTP slot you want to play.
A deposit bonus gives you extra funds when you make your first or next deposit. For example, a 100% match bonus doubles your money, giving you more to play with. The best casino bonus usually includes high match percentages and fair terms.
Some casinos allow bonus funds to be used on high-RTP games, but others may limit which slots qualify. Always read the terms to check if your chosen game is eligible and to understand the wagering requirements.
No deposit bonuses give you free cash or spins just for signing up - no payment needed. They're a risk-free way to try out a casino and possibly even a high RTP game if allowed. These no deposit bonus casino UK offers are a great way to explore new sites without spending anything.
These bonuses are smaller but still valuable, especially if they can be used on games with strong payout rates. Just remember, they often come with stricter terms, like low cash-out limits or higher wagering requirements.
When choosing between 99% RTP slots and lower RTP games, the difference often comes down to long-term value. A 99% RTP slot returns more of your bets over time, making it a better option for players who want more consistent results.
On the other hand, low RTP slots usually return less - sometimes only around 90-94% - but they often include exciting bonus features or big jackpot potential.
Here's how these two types of games compare when it comes to volatility and jackpots:
99% RTP slots like Book of 99 and Mega Joker are top high variance slots. This means they may have long stretches with few or no wins, but they can also deliver big payouts when they hit.
Low volatility games are often slots with frequent payouts that can give you a lot of small wins, but they are less likely to hit a big win, and the games often don't even include a jackpot. This makes these games feel very steady, but you will miss a single big payout.
While 99% RTP slots don't usually focus on jackpots, there are exceptions. Mega Joker is a good example, featuring a progressive jackpot that adds extra excitement on top of its high RTP.
Low RTP games are more likely to include progressive jackpots or massive top prizes. These can pay life-changing amounts but usually come with lower RTP and tougher odds.
Only a small number of game developers focus on creating high RTP slots, and even fewer get close to the 99% mark. While 99% RTP games are rare, some providers have stood out by releasing titles that either hit this level or come very close.
If you're looking for slots that give you more return for your money, these are some of the top names to know.
NetEnt is one of the most respected names in online slots, known for smooth gameplay, bold graphics, and fair mechanics. It's also one of the rare providers to release a 99% RTP slot - Mega Joker.
Though most of NetEnt's newer slots have a lower RTP, the brand is still a go-to for quality games. NetEnt casino sites are licensed in the UK and offers a good mix of classic and modern titles with clear game information and fair features.
Relax Gaming is behind Book of 99, one of the most well-known modern slots with a 99% RTP. This provider is well-known for fun and beautifully made slots.
Relax has built a strong reputation in recent years for pushing the boundaries with mechanics and fairness. While not all its slots hit the 99% mark, Relax Gaming casinos consistently deliver enjoyable and innovative games.
Thunderkick is an independent provider known for its unique slots and standout design. While they don't have any 99% RTP slots, they have come close with games like 1429 Uncharted Seas, which features a very high RTP of 98.6%.
Players like the best Thunderkick slots for their creativity, reliability, and focus on user-friendly gameplay. Their titles often offer a great balance between entertainment and good payout potential, even if they don't quite reach the 99% mark.
Slots with a 99% RTP offer great long-term value at online casinos. They are ideal for players who want fairness and prefer to get more of their money back over time. However, these slots may have some downsides, especially regarding their features and how easy they are to find.
Higher long-term returns
Better value for bets
Smaller casino house edge
Available at some UK casinos
Limited game selection
Usually not eligible for bonus wagering
Mostly come with high volatility
May have outdated design and graphics
Alternative RTP slots offer a better variety than 99% RTP slot games because the lower RTP means the games have a higher house edge, making them better for casinos.
98% RTP slots are just about as sought-after as those with 99% RTP, but you'll soon notice that they have much better availability at the UK casinos.
Among slots with 98 RTP, you can spot popular titles like Money Cart 2, Jokerizer, 1429 Uncharted Seas, and Blood Suckers. So, if you're looking for the next best games to play in addition to 99% RTP games, check out our page showcasing 98% RTP slots and casinos where you can find them.
97% RTP slot games are still considered better options than your standard online slots. And, just like it's easier to spot slots with 98% RTP than 99% RTP, you'll soon notice that finding slots with 97% RTP is even easier.
97 RTP slots include several player favourites, such as Sugar Rush 1000, Big Bad Wolf, White Rabbit Megaways, and Blood Suckers Megaways.
96% RTP slots present the most typical RTP you'll find in online slots. It's still worth knowing that most casinos tend to favour slots that have even lower RTP than this, so choosing a slot with 96% RTP can still be worth it. Naturally, you can find more 96 RTP slots at UK casinos than any of the alternative options mentioned above.
96% RTP slots include ever-popular Starburst, Reactoons, Gates of Olympus 1000, and Bonanza Megaways.
