After completing every stage in the game, you'll unlock Extreme Mode. This features tougher enemies and a higher difficulty level.
Unlockable How to Unlock Extreme Mode Complete every stage in the game.
Unlock Stage Select
After beating the game, you'll unlock the Stage Select mode in the main menu. You can only select stages that you've already completed, through.
Unlockable How to Unlock Stage Select Beat the game.
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