Dead Space: Extraction
Unlock 4 levels from Challenge Mode
At the title screen, press: down, up, left, right , right, left. A sound will indicate that you have put the code in correctly.
Contributed By: xenomorph77.
Expert and Impossible Difficulty
Successfully complete Chapter 10- "Secrets & Salvation"- to unlock Expert and Impossible Difficulty modes for play in Story Mode.
Contributed By: DarkSonic03.