During play of a casino game, in response to a wager, a hidden bonus feature unknown to the player occurs to interrupt game play. The occurrence of the hidden bonus feature may be at a random statistical frequency or other event. When the player inputs a correct response to the hidden bonus feature during casino game play, the player receives an additional award. If a correct response is not received or if the hidden bonus feature is ignored, the player does not receive any further award. The hidden bonus feature does not affect the outcome of the play of the casino game. After the feature ends, casino game play resumes to a game outcome in response to the wager.