UBOK./guide

Bone Neck
Found in Zipper World by entering the glowing door and interacting with the pebbles on the ground.

Skull
Enter the Foggy Park, walk to south till reach the second tree, then go horizontally to either direction to find it.

Stretchy
Enter the Underwater World, find a transparent object at a short distance to southwest from entrance.

Normal/Common Ending
Collect all 7 Bones (effects), wake up and exit the (previously closed) door of Eric.'s room.

Secret Ending
Collect all 7 Bones (effects) and 9 sheets of paper (pages). After doing that, wake up and exit the (previously closed) door of Eric.'s room.