The Ghost World is found in the Sky Garden. There is a tunnel there which seems completely dark and cannot be lit up by the Lamp effect. It does not branch. The tunnel ends in a patch of flowers, which, when interacted with once, makes the screen flash slightly and changes the environment outside the tunnel into a world of blue blocks. Listening closely there seems to be faint sound of sniffing, as if crying in the background. Strange floating blue shapes that can be walked through are scattered about. This is also where the ghost that you recieve the triangle hankercheif ability from