Atomic Pumpernickel behaves similar to the grenades. The projectile is fired forward powerfully and bounces several times, before exploding in a shrapnel of bread. It is extremely powerful, but hard to aim with due to the lack of crosshairs. As a result, it is best used against ground enemies.
In Stage 9, it is required in order to finish the stage. In replacement of a boss, 3 enemies will be inhabiting the phone booth the player must enter. In order to defeat the enemies, the player must launch pumpernickel into the booth when the door opens.