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.

The slots with the highest RTP rates at licensed US online casinos are: Blood Suckers (98%), Starmania (97.87%), White Rabbit (97.72%), Medusa Megaways (97.63%), Guns N' Roses (96.98%), Blood Suckers 2 (96.94%), Jimi Hendrix (96.9%), Butterfly Staxx (96.8%), Dead or Alive (96.82%) and Fruit Shop (96.7%).