Eternal Darkness
Books: Secret Codes 2003 - The Ultimate Code Book: Cheating Made Easy
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Level select
Invincibility
Alternate ending
Skeleton screen
Recovery
Defeating zombies
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Successfully complete the game to unlock the "Credits" option.
Level select
Successfully complete the game twice on the same save file to
unlock the "Jump To Game" option.
Invincibility
Successfully complete the game three times on the same save file
to unlock the "Eternal Mode" option in the "Jump To Game" menu.
Alternate ending
Successfully complete the game three times on the same save file,
choosing a new story path each time.
Skeleton screen
At the main menu screen "New Game", "Load Game", and "Options",
select "Options" and the picture of Alex will turn into a skeleton.
Recovery
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.
Defeating zombies
If you have a torch and you are face a large group of zombies,
swing the torch at them. They will die in one hit. You will have
to do a final blow quickly because they will disappear if you are
too slow. Note: This will only work on the normal common zombies.