Easily obtain 3 stars on any bonus map
Have game in Hard mode (or Nightmare if you've unlocked it) and choose a bonus mission. When the mission starts, change it to Easy. The clock is longer on harder modes, but when you change the difficulty, the longer level time stays and the enemies are easy. When you finish the bonus level, the time bonus will be very high.
Contributed By: ae121584.
Unlockable How to Unlock Nightmare Difficulty Finish the game to be able to play on this difficulty.
Contributed By: KeyBlade999.
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