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One in a Hundred is the 15th level in Bloons. This level introduces the Boomerang Bloon. There is only one Boomerang Bloon yet there are 100 bloons total, hence the name. To win, the player must first shoot the Boomerang Bloon, then throw the newly obtained boomerang at the rest of the regular bloons at the right angle in order to get the minimum amount of pops required to pass.