A higher class of bloons. They take multiple hits to pop, and here is the list of them: The M.O.A.B, the B.F.B, the Z.O.M.G, the D.D.T, and the B.A.D.
Person 1: I'm in the late game for the first time, and that's a ton of M.O.A.B Class bloons!
Person 2: Yeah, there is a ton of them. They rarely spawn normal bloons in the late game.