Unlockable: Authentic Difficulty
To unlock Authentic Difficulty, beat the game on any other difficulty setting.
Unlockable: Multiplayer Characters
To unlock new characters for use in multiplayer mode, insert the following code at the in-game cheats menu: HI9WTPXSUK.
Unlockable: Kilroy Detector
To activate a Kilroy detector that will alert you when a Kilroy is nearby during gameplay, insert the following code at the in-game cheats menu: 4V35JZHQD6.
Unlockable: All Reconnaissance Reports
To automatically unlock all reconnaissance reports in the game, insert the following code at the in-game cheats menu: 0ZNDRBICRA.
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