To play casino over under, a player places chips in the ante spot to start and can optionally bet on the bonus. The player is then dealt one card face up and can fold, losing their ante, or declare their three card hand will be over 23 or under 18 by matching the ante. The dealer then deals the remaining cards and the total of the three cards determines if the player or house wins based on being over or under the thresholds, with hands of 18-23 always winning for the house. Payouts are even money except for the bonus which has its own paytable.