Popping Power, also called Pierce, is how many bloons a tower's projectiles can pierce through. 1 popping power=1 bloon pierced. Most towers have an upgrade that increases popping power. In addition, the Monkey Village's Monkey Fort upgrade increases most nearby towers' popping power by 1. In Bloons Monkey City, the amount of Popping Power can be influenced by Monkey Knowledge Packs. When a specific rank regarding "pierce" of a tower is unlocked, the Popping Power may increase by either an integer, a percentage, or by an "every Xth shot" (where "X" is an integer).