Were you looking for the Boomer upgrade from Bloons Super Monkey, or the Bionic Boomer upgrade of Boomerang Thrower in BTD5?

Boomer is the 16th level of Bloons. It is the second level in Bloons to contain a Boomerang Bloon and it consists of three 4x3 squares, one with a Boomerang Bloon directly above it.

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