Extra Characters in Multiplayer Mode:
Complete the game with A rankings in all missions on each game's difficulty. Any characters with "New" on it means its unlocked.
Extra Options:
Complete the game once. In the "Extra Options" mode, you can access all BGMs and Movies used in the game.
Shadow Stalker Difficulty:
Complete the game once. Start a "New Game" and select the hardest difficulty level "Shadow Stalker" will be unlocked.
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