Maximum Power is a gameplay feature that appears in Bloons 2. It is an in-game boost, accessed by clicking the red MAX POWER button to the right of the dart count. When activated, it automatically sets the dart's power to its maximum limit, replacing the need for the player to have to time the power gauge perfectly to get maximum power. It doesn't cost anything to activate. Max power must be activated every throw if the player wants every throw to have Max Power.
Maximum Power works very effectively in conjunction with the premium upgrade, Dart Guideline.