[0]. Don't pick up ammo or the gun during the playthrough. Picking them up prevents the last murder scene from activating.
1. Get the Fuse and activate the fuse box
2. Go to hallway and get the Empty Notebook
3. Get the Dummy Finger
4. Go to the attic and get the Basement Keys next to the bed
5. Read the text on the wall for the first giggle and get the Object Made of Celluloid from behind the stack of TVs
6. Combine Dummy Finger and the Object Made of Celluloid and point it at the fallen cupboard downstairs to solve the first murder
7. Get the Bolt Cutters and the VHS tape "Derelict House Footage"
8. Activate the second giggle by looking at the lights near the boarded door in the attic
9. Go to the basement and point at the dead body at the back of the room to solve the second murder
10. Get the Attic Window Key, turn around and run to the door. Don't get bitten!
11. The doors are blocked. Don't panic, loop around the bodies and stun the Molded by kicking the dead body hanging from the ceiling. As soon as the Molded falls down, run to the blocked door and kick it down
12. Take the Lock Pick from the heater before you leave the basement
13. Get back to the kitchen. Use the Lock Pick to unlock the drawer. Take the Axe.
14. Hit the portrait of the woman with the bag on her head to activate the third giggle
15. Point at the boarded door under the stairs to solve the third murder
16. Look at the mirror and do a quick turn (Down + B with a controller, X with a Keyboard) to get the fourth giggle
17. Go to the attic and point at the white and blue wires above the bed to solve the fourth murder
18. Pick up the phone. This is important, without this the final puzzle won't be activated.
19. Go to the basement and look at the doll on the floor for the fifth and final giggle
20. Go to the kitchen and point at the pot on the table to solve the final murder
21. Get back to the attic, open the previously locked door near the ladder and take the Dirty Coin
22. Leave the house through the attic window.