Eternal Darkness - Sanitys Requiem cheats and cheat codes for Gamecube

View credits: 
Finish the game once

Stage select: 
Finish the game twice on the same save file

Unlock "Eternal Mode" in the "Jump To Game" menu:
Finish the game three times on the same save file

Diferent ending: 
Finish the game 3 times on the same save file and select a 
new story path each time. 

Skeleton screen: 
Go to "New Game", "Load Game", and "Options" menu and the picture 
of Alex will turn into a skeleton. 

Recovery: 
Learn the recover spell an you will able to recover different things.
Recover your sanity - Use Xel'lotath (Green)
Recover your magic - Use Ulyaoth (Blue)
Recover your health - Use Chattur'gha (Red)