The Evolution Bloon is a Purple Bloon with a cyan arrow on it. When it touches a bloon, that bloon will be "evolved" to the next rank. If it touches another Evolution Bloon that bloon will have a 30% chance of becoming a M.O.A.B. This bloon doesn't affect M.O.A.B-class bloons and Super Bloons. It takes 10 hits to pop and spawns a Ceramic Bloon when popped. It travels at the speed of a glued Yellow Bloon. There is an evolution map below. Its speed is between that of a M.O.A.B. and a B.F.B.
- Round 650 has a special Evolution Bloon that has the speed of a glued Lead Bloon. You better pop it before the B.T.D.4.5.6.C.R.E.E.P.E.R., or the B.T.D.4.5.6.C.R.E.E.P.E.R.'s BTD456Creeper Bloons will evolve into B.T.D.4.5.6.C.R.E.E.P.E.R.s again!
- Evolution Bloons also have a 10% chance to evovle into E.V.O.L.V.E.