Spit Wad Willy is an action game where the player controls Willy who shoots bouncing balls. Each time he hits a large one, it splits into two smaller ones; the goal of each level is to destroy all of them. Additionally there are robot enemies and bosses. Destroyed balls may leave behind power-ups such as slowing down time, an extra life or improving the attack. Each hit results in a life loss and the need to restart the level.