S.H.O.C.K.

The S.H.O.C.K (aka the Silver Hyperbloon Of Confirmed Kills) is a MOAB-class bloon that has a gigantic RBE of 75224 and it takes 8,600 hits to destroy. This bloon also has the same properties as leads and black bloons meaning it is immune to both explosions, lasers and sharp objects making it extremely hard to defeat. Even after doing so, you are then greeted by four ZOMGs.