An electronic gaming machine enables implementation of a base game, from which a bonus game may be triggered. Outcomes achieved during a play of the bonus game may be retained for use during subsequent triggering of the bonus game. For example, during play of the bonus game a player may achieve one or more game conditions, such as held special symbols, sticky WILD symbols, or award multipliers. These game conditions may be retained at the end of the bonus game and used if the player subsequently triggers another bonus game while playing the base game.