Alternate Ending 
     Complete the game three times, choosing a different story each
time, to earn the impressive alternate ending.
 
Skeleton Alex 
     Go to Options from the Main Menu to see the picture of Alex
change into a skeleton.
 
Game Clear Bonuses 
     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.