Eternal Darkness: Sanity’s Requiem

Alternate Ending
Complete the game three times, choosing a different story each time.
(Thanks to desrie_H99@hotmail.com)

Double-edged Sword
Playing as Anthony in Chapter 3, be sure to the man who is using a torch and talk to him afterwards. He will give you the double-edged sword, which can also be used in chapters 7 and 9.
(Thanks to desrie_H99@hotmail.com)

Game Beaten Bonuses
Beat the game once for the "Credits" option.
Beat the game twice for the option to be able to play as any of the chapters you want.
Beat the game a third time and you can activate invincibility for the chapter select mode.
(Thanks to desrie_H99@hotmail.com)