Eternal Darkness: Sanity's Requiem Cheats
Opening the safe:
The easiest way to open the safe is to use the D-pad. Enter code
Code: D-pad the code is 59 Right, 81 Left and 46 Right
After finishing the game three times on the same save file you will unlock the "Eternal Mode" option in the "Jump To Game" menu.
After finishing the game twice on the same save file you will unlock the "Jump To Game" option.
Finish the game three times on the same save file, choosing a new story path each time.
After finishing the game you will unlock the CREDITS option.
At the main menu screen NEW GAME, LOAD GAME, and OPTIONS appear, pick OPTIONS and the picture of Alex will turn into a skeleton.
Lose your sanity
To intentionally lose your sanity, kill the servants or other people who have not been taken over by Bonethieves.
Use the Reveal Invisible spell with the Mantorok Rune to make your character invisible.
When you learn the recover spell, use Chattur'gha (Red) to recover your health, Xel'lotath (Green) to recover your sanity, or Ulyaoth (Blue) To recover your magic.