Obstacle Demolition is a Perk in Bloons TD 6. It reduces the cost of all Removables by 80%, with a maximum benefit of $2000 saved per obstacle. It does not affect Gizmos.
Tips
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A useful Perk on certain maps with anything that can be "removed", specifically removable obstacles and constructable objects (e.g. High Finance's buildings, Mushroom Grotto's mushrooms lighting up). However, since this Perk doesn't affect gizmos (e.g. Workshop's gadgets), not all maps are made easier, just the maps that contain "removables".
Due to the cap in savings, this perk is less effective on specific maps like Three Mines 'Round.