Saboteur Bloon

The Saboteur Bloon is a special bloon that only appears if you have over 10 towers onscreen. It has the speed of a blue bloon, and has what appears to be a dart monkey inside. When the bloon is popped, the monkey inside will "rig" a random tower of yours. It will then place itself with your other towers. Both the rigged tower and the fake dart monkey will appear to behave normally, but will attack towers when there are no bloons on the screen. Any tower blocking a rigged tower will also be damaged. Damage dealt by a rigged tower does not register until the end of a round, as sabatoge is a highly secret operation. You can get rid of the rigged towers by selling them for the sell price, or by waiting 3 rounds, when they will explode and give you nothing.