In order to launch attacks on other players, the player must first train zombies with the Coach Zombie, in a similar way to how they grow plants; although only one wave can be trained at time. Also, they can only have 10 waves at a time. More zombie waves are unlocked as the town is expanded. There are three waves in each attack, and in each wave the player can choose a trained zombie wave to use, and that zombie will then attack along with two other previous zombies. After each wave, a new grave will appear at the farthest point the zombies reached, and that is where the zombies will spawn in that wave. If the player fails to invade the building within three waves, they lose. During combat, they can collect fog that falls from the sky, and spend it on boosting zombies (2x as fast for 3 se