Cheats for Dead Space: Extraction on Wii.
Unlock Challenge Mode + 4 levels:
At the title screen (where it says Press A Or B To Start) use the D-pad to press Down, Up, Left, Right, Right, Left. If entered correctly you will hear a sound. At the Main Menu you will now be able to enter Challenge Mode and play any of the four newly unlocked levels: Extraction Site, Central Plaza, Maintenance Bay, and Mess Hall.