One-WAY/guide

Frying Pan
Obtain from giant notebook in dream bedroom.

Flower
Get from pink flower in flower world.

Skateboard
Get from an NPC holding a skateboard in the 2nd part of flower world.

Flame
Get from flame NPC in flame world straight down and slight right.

Reaper
Wear a black coat and black shoes. Talk to Reaper NPC in flame world.

Okiku
Talk to the well in ghost world and wait for countdown then talk to the blue NPC that pops out.

Long Hair
Talk to sleeping NPC in room world (purple door with a "Z" on it).

Firefly
Talk to cloud bug in cloud world.

Doll
Get from talking to random head in heart world (after cloud world).

Portal
Talk to thing in the middle of the last room in white world.

Hospital Gown
Talk to girl on wall NPC in room 108 in white world.

Skull Dress
Talk to skull dress in police station.

Panda Hat
Talk to panda in bamboo world.

Umbrella
Solve riddle from girl under tree in bamboo world.