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Bloon Containment Unit is the Special Building required for allowing research the Bloon Trap upgrade. It costs $35000 and awards the player 700 xp. It takes 48 hours(?) to finish construction. It consumes 60 and takes up a 1x1 tile space. It requires Level 21 to unlock.
- The building in the Flash version appears to have trapped red bloons, while the mobile version appears to be a large glass building with a wider variety of non-MOAB-class bloons, including camo bloons. Ironically, Bloon Traps in the mobile version do not trap camo bloons unless the traps themselves are under camo detection.