Iceball is a giant sphere of ice released from Dr. Zomboss's Zombot in Level 5-10, Dr. Zomboss's Revenge, and Air Raid. In the Roof battles, it crushes plants in a single lane, and in Air Raid it damages the Flower Pot plane.
During the Roof battle, the Zombot will move its head down to pick a lane on which to place the projectile. If the Zombot's eyes turn blue, it will shoot an iceball. After a few seconds, the iceball will roll down the lane and crush every plant it touches until it is destroyed or it rolls off the end of the lane; it will also destroy any Roof Cleaners in the lane. It can be destroyed when it is hit by the fire from Jalapenos.
- See Dr. Zomboss for more strategies.
You have the option to ignore this iceball. However, if you ignore it you will lose all your defenses on that row and your Roof Cleaners will get flattened. The iceball is technically harder to destroy than a fireball because the player has to plant the Jalapeno in the same lane and it is more tempting to use than an Ice-shroom to help clear out zombies.
- The iceball in the Nintendo DS mini-game Air Raid has an iceball that looks more like a bubble than a normal iceball released from the Zombot's mouth.
- The iceball and the fireball are the only things in the game that can destroy Roof Cleaners without triggering them.