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 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 the other 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.