The Glass Bloon is a bloon that only appears in Bloons Super Monkey 2. It is made of glass and immune to the upgrades in the tech path (including lasers, plasma, whips, etc.) unless research is used. Taking up to 14 hits to pop, any less will result in a bloon spawning. The bloon spawned may be anything up to and including Zebra Bloons, although Lead Bloons will not be spawned. In the mobile version of the game, the glass bloon is also immune to Storm weapons, but only the arm weapons.