Infamy Bloon is not a single bloon, but 2 bloons connected to each other, one is Masked Bloon, a fast and invincible bloon, and another one is Heart Bloon, a slow but tough bloon. Masked Bloon is invincible and can't be damaged by any way, however it can still be popped in one way. Masked Bloons always spawn along one Heart Bloon for each mask, each Heart Bloon spawned at the same frame as the Heart Mask. Heart Bloons have 40 HP. When a Heart Bloon is popped, the Masked Bloon connected to it is destroyed/killed/poppped/whatever you want to call it.