Highest RTP Slots

RTP (return to player) is the share of all the money staked on a slot that it pays back over the long run. The slots with the highest published RTP return 98% to 99%, against roughly 96% for most popular titles: Book of 99 and Mega Joker at 99%, Jackpot 6000 at 98.9%, 1429 Uncharted Seas at 98.6% and Blood Suckers at 98%. Every figure below comes from the game studio’s own page.

Highest RTP Slots: The List

“Cost per £100” is what the RTP implies you lose on average for every £100 you stake: £100 minus the RTP. Each figure is the highest RTP the studio publishes for that game.

What the RTP Difference Is Worth

A slot at 99% keeps £1 of every £100 staked on average, one at 96% keeps £4, and one at 90% keeps £10. That is ten times the cost for the same amount of play. Remember that you usually re-stake your wins, so the RTP applies to far more than your starting balance: at 96%, a £20 balance lasts for about £500 of stakes on average (£20 divided by the 4% the game keeps), and at 99% for about £2,000.

The Highest RTP Slots in Detail

Book of 99 (Relax Gaming) – 99%

Relax Gaming describes Book of 99 as the first “Book of” slot with a 99% RTP. Alongside the usual three-scatter trigger, collecting 99 books in the base game also triggers 10 free spins.

Mega Joker (NetEnt) – 99%

A 3-reel, 5-line classic from 2008 with two modes. You play the basic game; when you win, the win moves into a Supermeter credit and you can keep playing it on the top reels, staking 20, 40, 100 or 200 coins a spin, and collect it back to the basic game at any time. There are also mystery wins and a progressive jackpot. NetEnt lists a 17% hit frequency.

Jackpot 6000 (NetEnt) – up to 98.9%

Another 3-reel, 5-line classic, from 2007. After a win you can gamble it on a heads-or-tails double-up or move it into Supermeter mode, where each spin costs 20 coins and random jackpots and a special Joker paytable come into play. NetEnt describes the RTP as reaching up to 98.9%.

1429 Uncharted Seas (Thunderkick) – 98.6%

A 5-reel, 25-line voyage slot with expanding wilds and a free spins bonus. Thunderkick rates it low volatility, with a maximum win of 670 times the bet, meaning smaller wins more often.

Blood Suckers (NetEnt) – 98%

A 2009 vampire slot with wilds, scatter wins from two scatters and a free spins round. NetEnt lists a 45% hit frequency, the highest of the NetEnt games here, and a top win of 900 times the bet.

Secrets of Atlantis, Steam Tower and Jack Hammer (NetEnt) – about 97%

Secrets of Atlantis (97.07%) is a 5-reel, 40-line slot that pays both ways, with Nudge Wilds and Colossal Symbol re-spins. Steam Tower (97.04%) has free spins where the multiplier rises floor by floor up a 16-floor tower. Jack Hammer (96.96%) uses Sticky Win re-spins and free spins with every line win tripled.

Dead or Alive, Dead or Alive 2 and Twin Spin (NetEnt) – about 96.5% to 96.8%

Dead or Alive (96.82%) gives 12 free spins with sticky wilds and doubled wins and has a top win of 8,600 times the bet, the highest of the NetEnt games here. Its sequel Dead or Alive 2 is at 96.8%. Twin Spin (96.55%) links two or more identical reels on every spin, with 243 ways to win.

RTP Is Not the Whole Story

RTP is a long-run average over millions of spins. In a single session, how the game pays matters as much:

• Hit frequency is how often a spin wins anything. NetEnt publishes it: 45% on Blood Suckers, 41% on Gonzo’s Quest, 23% on Starburst, 10% on Jackpot 6000.
• Volatility is how the return is spread. A low-volatility game pays small wins often; a high-volatility game pays rarely but bigger. Two slots with the same RTP can feel completely different.
• Maximum win caps how big a single spin can get: 670 times the bet on 1429 Uncharted Seas, 8,600 times on Dead or Alive.

The Same Slot Can Run at a Lower RTP

Many studios release a game at several RTP settings and let the casino choose. Blueprint Gaming publishes Fishin’ Frenzy at anything from 90% to 96.12%, and Eyecon publishes Fluffy Favourites at 95% or 93%. The game looks and plays the same; only the return changes. So the figure that matters is the one in the game you are actually playing: open the help or paytable screen, which normally shows it, before you start.

Higher RTP Than Slots: Table Games and Video Poker

Even 99% is not the best return in a casino. 9/6 Jacks or Better video poker returns 99.54% with perfect play, blackjack with basic strategy typically keeps well under 1%, and single-zero European roulette keeps 2.7%. The catch is that those returns depend on the rules and, for blackjack and video poker, on playing every hand correctly.

Where to Play High-RTP Slots

These operators reviewed here accept players from the UK and carry large slot lobbies. Our reviews list NetEnt and Relax Gaming at Lussurio, and Thunderkick and Relax Gaming at iWild. Availability depends on where you live, and not every casino runs every title, so search the lobby for the game and check its RTP in the help screen.

Stake Limits in Great Britain

In Great Britain online slot stakes are capped by law at £5 per spin for players aged 25 and over and £2 per spin for 18 to 24 year olds, whatever the game’s own bet range. Elsewhere, the limits depend on the country and the casino.

Playing It Sensibly

A high RTP lowers the average cost of playing; it does not make a slot something you can beat. Set a budget before you start, choose a stake that fits it, and stop when it is gone. Our guide to online slots explains how slot features work. Free, confidential support is available at BeGambleAware.org. 18+ only.

Highest RTP slots: frequently asked questions