The Stone Maze is an area that is accessible from Chocolate World by interacting with the pink, blinking, cone-headed portal.
Features
To get to the Bowling Zone, travel eastward until you see a dead-end. At that dead-end, head north, then turn to the east at the first intersection. Go south at the next intersection and continue until you see a red bowling ball (this is the portal).
Kanashii-Tan can be found by going in the following directions at the first-encountered intersections (starting from the intersection right before the portal to the Bowling Zone): east, south, east. There should be a small, tunneled entrance; Kanashii-Tan is inside this room.
If you take a left at the intersection right before the Bowling Zone portal, then go north at the second intersection after that and continue north, you'll encounter a portal to the Spelling Room. In this room, you must enter the doors with the correct letters over them to spell Urotsuki. Once you spell her name, a hole will appear in the floor that transports you to a room filled with eyes that has an identical hole in its floor. This hole drops you into Theatre World.
Connections
Blood World (one-way, cannot enter)
Bowling Zone
Spelling Room
Urotsuki's Apartments