Hard mode
Successfully complete the game on the normal difficulty setting with a "B" or higher rank to unlock hard mode.

Short mode
Successfully complete the game on the easy or normal difficulty setting to unlock short mode. Load the cleared saved game to toggle short mode.

Lv3PK mode
Successfully complete the game on the hard difficulty setting with an "S" rank to unlock Lv3PK mode.

Alternate ending sequence
Successfully complete the game on the normal or hard difficulty setting.