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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.

Mystery bonuses can be triggered by randomly selected times, amounts of play or jackpot size. On games with skill-based bonuses, skilled players will do better than unskilled players, but do not have an edge on the house.

A slot bonus game, or minigame, is an extra gameplay feature or mode where you can maximize your winnings. Many modern slots in land-based casinos and online casinos come with some type of bonus feature if not a full bonus game round.