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Beat Eternal Darkness once for the "Credits" option.

Beat the game twice and you will have 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.

Complete the game three times, choosing a different story each time, to earn the impressive alternate ending.

When playing as Anthony in Chapter 3, make sure that you save the man who is using a torch and afterwards talk to him. He will give you the two-edged sword, which can be used in chapters 7 and 9 as well.

Go to Options from the Main Menu to see the picture of Alex change into a skeleton.