Ultra-Juggernaut — The Juggernaut balls can bounce around inside the craters and rehit Bloons they've already hit after each bounce, making them much more effective. Place near the entrance of a crater and set it to First, or near the exit of a crater and set it to Strong.
Mortar Monkeys — Mortars can deal a lot of damage when aiming at the craters, and their targets can be easily adjusted if Bloons pass through.
Wizard Monkeys — With Guided Magic, Wizards can see and attack through the walls of the craters. 3-0-2 Arcane Mastery does well in the middle. 2-2-0 Wall of Fire should have its target point set to the middle of a crater.
Razor Rotors — The rotors can cover an entire crater.
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Basic Deflation strategies
Basic Apopalypse strategies
Basic Half Cash strategies
Basic Alternate Bloons Rounds strategies
Basic Impoppable strategies
Basic CHIMPS strategies