here's my theory about the Unknown M.O.A.B. class bloon
It might be called the "Anti-Monkey (A.M.)"
it is compeletly white, is 150% (1.5x) the size of a D.D.T. and when popped, releases 8 Z.O.M.G.s, now THATS really hard, Impoppable for the newbies.
takes 200% (2x, twice) as much hits to pop a Z.O.M.G.
has no propellor, glides like a D.D.T., Vortex, Something like that, has the speed of 7 compared to a red,lead,M.O.A.B.. luckily, it only appears on a really long track.