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.