Complete all missions with an "A" rank on all difficulty settings to unlock bonus characters in Multiplayer mode.
Completion bonuses
Complete the game to unlock the Shadow Stalker difficulty setting and "Extra Options" selection, which allows all BGMs and movies from the game to be played.
Shadow Stalker difficulty
Successfully complete the game to unlock the "Shadow Stalker" difficulty setting in a new game.
Unlock Enemy 4
In multiplayer mode select Craig,as P1 Win 15 Matches in 3 com.
Unlock Enemy 5
Complete the tutorial on the main screen, unlock enemy 4, then press Start on the main menu, complete Episode 1 at all difficulties.