Get the 'A' ending.
Acquire all trophies.
Reach the end of the Apartment level.
Finish the game on Nightmare difficulty.
Defeat the glower.
Answer the phone.
Become a delinquent.
Collect some butterfies.
Collect MORE butterflies.
Find some notes.
Find ALL notes.
Reach the end of the Hospital.
Survive.
Find tons of items.
Reach the other side.
Reach the end of the School.
