1. A gaming system comprising: a game controller arranged to generate a skill outcome in response to an input from a player and that is at least partially dependent on a skill of the player, the game controller also being arranged to generate an artificial outcome that is controlled by the game controller; a game outcome controller arranged to generate a game outcome based on a criterion such that, if the criterion is met, the game outcome is at least partially determined by a first one of the skill outcome and the artificial outcome and, if the criterion is not met, the game outcome is at least partially determined by a second one of the skill outcome and the artificial outcome; and a reward allocator arranged to allocate a reward that is at least partially dependent on the game outcome.