To unlock Cherokee Difficulty, simply complete Normal difficulty first.
Concept Art Galleries
Complete the needed difficulty to unlock a concept art gallery.
Unlockable How to Unlock Gallery 1 Complete Normal Difficulty Gallery 2 Complete Cherokee Difficulty
If you complete the game's story mode, you will receive a Prey Xbox 360 dashboard theme.
Unlockable How to Unlock Prey Dashboard Background Complete Story Mode
Contributed By: gamedude222.
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You can submit a problem report for any non-working or fake code in the lists above.