The Ugga Bugga slot machine game has the highest payout percentage, at 99.07%. The second highest is Mega ❤️ Joker by NetEnt, with a 99% RTP. Jackpot 6000 by NetEnt and Uncharted Seas by Thunderkick come in second and ❤️ third, with RTPs of 98.8% and 98.6%, respectively.