Gap Bloon is the special boss of the Event Time Paradox. During that Event, it'll sometimes randomly appears in a round between 110 and 120 and overtake that round, it can appear on any track. When it comes, a message will appear before the round with a picture of it saying "Special Boss Gap Bloon Incoming!" (cheesy message, I know.) The Gap Bloon has M.O.A.B. Class properties although it's technically not a M.O.A.B. Class bloon.