Cloudy with a chance of shooting stars and eggs
Starry Night Event
sound4b (1F), se018-0016 (2F), n3-tWW (Starry Night Event)
The Planetarium (星洞, Hoshi Hora, Star Cave) is a location hidden deep within the dream world, accessible from a doorway at the top of the Abandoned Apartments.
The Planetarium is an abandoned building where Urotsuki can gaze at the stars (projections of them, that is).
The first area of the Planetarium is a blue cavern containing a large scaffolding frame connected by ladders and a pink Egg on the floor on the far east of the area, which will unlock Menu Type 10 if you interact with it. Climbing up the scaffolding leads to a faintly visible blue hole in the scenery that will take you to the main area of the Planetarium.
The first floor of the Planetarium contains an empty reception window, where some kind of drinks may also have been sold, judging by the bottles and cups on the counter. A ragged poster of what appears to be Saturn is pinned to the wall. There are ropes attached to posts adorned with stars nearby, and lights overhead, though they are burnt out. Further up the hall are papers left on the floor and an abandoned top hat. At the end of the hallway there is an elevator, which arrives with a tinny ding and transports Urotsuki to the second floor.
The second floor of the Planetarium is the theatre, containing several comfortable-looking chairs. Sitting down in any of them will begin the Starry Night Event, and Urotsuki can look at the myriad of stars in the night sky, as well as the projector. After viewing the event, the exit sign for the white door in the corner of the room will illuminate. This door leads to the Deserted Town. It cannot be used before seeing the Starry Night Event, and is a one-way trip back to the town square.
Nexus → Red Streetlight World → Gray Road → Grass World → Green Neon World → Construction Frame Building → Cog Maze → Forest Pier → Abandoned Factory → Arc de Pillar World → Flooded Ramparts → Mansion → Deserted Pier → Deserted Town → Abandoned Apartments → Planetarium