Paul Barber
Last updated: September 9, 2021

What Does RTP % Mean?

Slot machine games that contain bonus rounds and free spins tend to have variable RTP percentages, which increase during the bonus rounds, so that is worth looking into when choosing a slot with a high RTP. There are even slot games with buy-in bonus rounds, so you can skip the base play, moving to the bonus games immediately, which makes sense if the RTP is higher. The higher the RTP percentage, the better the payouts, so slots with RTPs of over 97% will shift the odds in your favour. 92% or less is low, up to 94% is average, and up to 96% is acceptable. Slot machines with an RTP of over 97% are considered excellent, and anything over 98% is phenomenal! 

Highest RTP % Slots For: September 2021

Ugga Bugga (Playtech) RTP: 99.07%

Ugga Bugga is a Playtech slot released in 2006 with an RTP percentage that increases to 99.07%, which is a pretty good deal. Ugga Bugga is situated in a jungle, filled with tropical fruits and tribal masks, categorising its reels and rows into two groups, each having three reels and five rows. Even though the slot only appears to have three reels, there are ten sets of three reels and a single payline through all of them, and the game also has its wild symbol and a bonus feature. It is one of Playtech's older games; however, it still comes with a vast RTP rate of 99.07%, making it one of the developer's very best and most appealing games. You can bet up to £100 per spin in the game, and it features colourful jungle-themed symbols to enjoy.

Rainbow Riches Pick and Mix (Barcrest) RTP: 98%

This famous pub slot machine made a seamless transition to the world of online casinos. It was so successful it spawned several popular spin-offs and sequels. They include Rainbow Riches Pick' n' Mix, which has a much higher RTP payout percentage of 98%. Rainbow Riches Pick' N' Mix is a five-reel slot with three rows and twenty fixed paylines; the game's design is similar to the original with gold-framed reels in front of a green and pleasant Irish landscape although the mountains in the distance look impressive. In terms of graphics and game symbols, the design looks familiar. The visuals are slightly different; however, the icons depicted as the game logo and playing card symbols nine to ace. You will notice Wild does not payout, and the highest paying symbol is the Rainbow Riches game logo that can award you 500 coins for a five of a kind on the reels. Rainbow Riches Pick n Mix slot has 5-reels and 20 fixed paylines. Before you start spinning the reels, all you have to do is set your stakes by choosing a bet per payline that can be anywhere from £0.20 to £500 a spin.

1249 Uncharted Seas (Thunderkick) RTP: 98.60% 

1249 Uncharted Seas is an extraordinary historical slot by Thunderkick with a theoretical RTP payout of 99%. Across the map of 1429 Uncharted Seas slots by Thunderkick, you'll find 5-reels and 25 paylines. The standard game symbols include the sun, the moon and the stars. There's a purple sea creature, an ancient lobster creature, a Wild octopus, a green sea creature and a pretty mermaid. The compass shows you the way, and the Scatter symbol gives you up to 50 free spins. The sailing ship is the Wild, and whenever it sails into view on the second to fourth reels, it transforms other icons into Wilds. Roll up the Wild, and it will expand across an entire reel as the sea serpent lifts your ship out of the ocean. You can sail on 1429 Uncharted Seas by using a coin from your treasure chest. For the brave seafarers, the betting goes up extensively per payline so that you can reap the rewards of the dangerous seas. 

Ooh Aaah Dracula (Barcrest) RTP: 96%

Horror and comedy are unlikely bedfellows in this original online slot Ooh Aah Dracula by Barcrest. Its design is cartoonish, which should brighten your day. There are many payouts to sink your teeth into and brilliant bonus games that you'll undoubtedly want more than one bite of, including three different rounds of Free Spins Bonuses, a Graveyard Bonus, and a Super Graveyard Bonus. There are 16 different ways to bet per spin, and the range will suit all slot players. There's also a high-roller button, whilst you can enjoy a bit of vampire hunting via all your latest mobile devices, whether they use iOS or Android software.

Jackpot 6000 (Netent) RTP: 98.86% 

Jackpot 6000 is one of Netent's most popular slots with an exciting classic with a retro vibe. The high RTP of 98.9% during the Supermeter mode is where you can impact the game's outcome. Jackpot 6000 is a traditional-looking game that continues its retro theme with classic symbols. You'll encounter lemons, cherries and bells, along with a joker and a star icon. Jackpot 6000 has 3-reels paying over five paylines. The coin values range is £0.01 to £2, with a minimum bet of £0.10 to a maximum of £10 per spin. To enjoy the features such as the Supermeter, you should play at the maximum bet level. While not having a progressive jackpot prize, the slot offers you a chance to win 6000 coins. During the base game and the Supermeter round, you can double your winnings by accessing the Heads or Tails bonus feature. To the left, there is a selection of coins with a head or a maple leaf. Make your choice by using the selection buttons to the side and see your winnings grow if the one you choose lights up.

Bloodsuckers (Netent) RTP: 98%

Bloodsuckers is an exciting online slot by NetEnt launched in 2013 with five reels and 25 pay lines. Blood Suckers is a non-progressive slot with a cult of vampires theme. The bonus symbols are the Sledgehammer and Bloody Bat. If you manage to gain three or more of these, you trigger the Bonus round. Once the bonus game activates, you move to the burial chamber full of coffins. At that stage, you will have to open each coffin and slay all the vampires. You gain a coin winning payout for each vampire that you kill, and the bonus round ends once the bats all fly out of their coffins. The Scatter icon is the vampire bride symbol, and if you can land three of them anywhere across your reel grid, the Free Spins feature starts, and you receive ten free spins. All the wins during the round come with a 3x multiplier.

Jokerizer (Yggdrasil Gaming) RTP: 98%

Jokerizer is a stunning, graphic-rich 3D slots game from Yggdrasil Gaming. The game features 5-reels and ten paylines and is among the first online slots from Yggdrasil Gaming. Jokerizer is a non-progressive slot with no free spins; however, you can enjoy entertaining and straightforward reel-spinning action with stunning graphic surroundings. The game offers a series of bonuses, and the Joker is the main symbol of this classic 3D video slot game. Some of the perks you will love include Jokerizer mode, mystery wins, and prizes totalling up to 6,000 coins. 

Monopoly: Mega Jackpots (IGT) RTP: 98.14% 

Monopoly is the best board game ever to exist, and IGT has united it with a Mega Jackpots slot offering. It comes with an RTP percentage of 98.14%, and there are nine paylines to place your wagers and five reels in play. The graphics are relatively straightforward, as it's one of the older games on this list. However, it does contain a progressive jackpot, and a Pass Go bonus and a Chance Win-Spin feature. It’s a Mega Jackpot game where you can win one of the biggest progressive jackpot payouts on offer with an online video slot. The prize pool often reaches £2 million, and the more people that play the slot machine, the higher the jackpot prize rises. All you should do is line up five Mega Jackpots symbols to win a life-changing cash prize. The top jackpot can award you 2,500 coins during the base game, which is nothing to scorn at, and you can bet one coin per payline. The online slot does an excellent job of recreating the fun of the Monopoly with fast-paced online slots action. The bonus rounds play and feel like a board game rather than a slot machine, especially when it comes to the features. You can activate two bonus rounds in the progressive game, the Pass “GO” Bonus feature and the Win Spin Bonus.

Joker Strike (Quickspin) RTP: 98.11%

Joker Strike is a five-reel game with ten paylines and a generous 96.46% RTP that raises to 98.11% thanks to a special 'hi roller' mode. As with most slots containing the word Joker in the title, this offering by Quickspin is retro through and through. You can expect to see classic symbols such as stars, bells and lucky sevens on the reels. The Joker is by far the most valuable symbol, and if he appears five times, you can win a prize of 100x your stake. A standard 'replace all other symbols' wild is also included and pays out 30x. To win, you have to match three characters, and you'll activate the Joker Strike feature. The winning symbol illuminates on a frame surrounding the primary reel. A moving light then moves around the edge, and if it rests on the winning character, you achieve a winning strike and replaces the symbol multiple times, and a payout follows.

 Book of 99 (Relax Gaming) RTP: 99%

Book of 99 is a slot machine by Relax Gaming and comes with five reels and ten paylines. The game has an ancient Greek theme; however, it's all about the Free Spins feature, which begins with ten free spins. A special expanding symbol comes into play, and expanding symbols appear in non-adjacent positions to give you winning payouts. With unlimited retrigger chances and 5,000x your stake winnings, you also collect wilds in the base game to trigger the free spins. More importantly, the Book of 99 RTP payout percentage is 99%, which is the highest return rate currently available anywhere.

Mega Joker (Netent) RTP: 99.00% 

Another Netent release, Mega Joker, has an incredible RTP percentage of 99%! When you play with maximum bet limits, your winnings move to the Supermeter, and you can choose whether to save them by pressing the Collect button, or you can keep playing by pressing the Spin button. Mega Joker is a splendid 3-reel slot with two reel sets. One is for regular play, while the other is for the Supermeter mode. For one coin bet, the RTP is somewhat low at 76.9%; however, with the maximum bet, the RTP percentage increases according to how well the Supermeter mode performs, rising to 99%. Netent has come up with a classic slot design also available on mobile. Mega Joker's simplicity is a welcome break from the overcomplexity of more elaborate online video slots

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