The Gatling Gun is a rare drop (0.5%) from any bloon that has a gun on it. When applied to a tower, it adds a secondary attack equal to a 2/2 dartling gun that auto-targets bloons.
*If used on a dartling gunner, it will give it another identical gun to its main gun. Up to three additional guns can be put on a dartling gunner.
*If used on a sniper, the sniper will shoot 3 times faster, but have a 50% chance of hitting the wrong bloon. Especially useful with 2/3 or 4/2 snipers.
*If used on a robo-monkey upgraded to 0/3, it shoots 4 darts from each arm, but locks all other upgrades.