The point of the game is to slap without getting slapped. When attacking you can either taunt or slap, how hard the slap depends on how long you keep the Z key down for. If you dodge an attack when in defending mode it is your turn to slap. But remember, if the attacker tricks you and you flinch three times the opponent gets a free hit. You win the game by making your opponent cross his or her pain threshold on the pain meter.