Unlockable: Idea
To unlock Idea (a hidden character), complete the game's prologue.
Unlockable: Palette Swaps
To unlock up to ten different palette swaps for your character, complete the game once through.
Unlockable: More Missions
To unlock three extra missions for subsequent playthroughs, complete the game once through.
Unlockable: More Difficulty Levels
To unlock two more difficulty levels ("Expert" and "Master"), beat the game once through.
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