WINBACK 2: PROJECT POSEIDON CHEAT CODES
None.
WINBACK 2: PROJECT POSEIDON TIPS & TRICKS
None.
WINBACK 2: PROJECT POSEIDON UNLOCKABLES
Bonus multi-player characters
Finish the game with an "A" rank on all missions under each game's difficulty setting.
Extra Options
Finish the game. The "Extra Options" menu allows the game's movies and music to be played.
Shadow Stalker difficulty
After finishing the game you will unlock the "Shadow Stalker" difficulty setting in a new game.