ETERNAL DARKNESS: SANITY'S REQUIEM UNLOCKABLES
View credits
After finishing the game you will unlock the CREDITS option.
Level select
After finishing the game twice on the same save file you will unlock the "Jump To Game" option.
Invincibility
After finishing the game three times on the same save file you will unlock the "Eternal Mode" option in the "Jump To Game" menu.
Alternate ending
Finish 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 appear, pick OPTIONS and the picture of Alex will turn into a skeleton.