The present invention relates to a gaming system and to a method of gaming. A gaming system comprises a game controller arranged to randomly display several symbols from a predetermined set of symbols and to determine a game outcome such as a game win based on the displayed symbols. Such gaming systems may be implemented as a stepper machine provided with reels or a video machine displaying “virtual” reels. One or more reels generated in play of a base game may be stored for later use in subsequent games. In a subsequent game or games, the game controller may select the stored reel to substitute for a reel generated by the game, in order to improve the game outcome. For example, the game outcome may become a “win” from a “lose” outcome. Or it may result in an improved win outcome. The one or more reels may be stored depending upon a trigger condition generated in the base game.