The Manhole is an adventure video game in which the player opens a manhole and reveals a gigantic beanstalk, leading to fantastic worlds. (via Wikipedia)
The game mechanics of The Manhole
Room TransitionTraversalWorld is navigated as discrete named locations; moving between them swaps the active room with no spatial continuity.
Room DatabaseWorldThe world is stored as discrete data records rather than a contiguous spatial map; the active record is loaded into a shared UI shell.
Each mechanic links to how to build it in Godot, with the retro games that share it.
Study the source
Open-source engine (GPL-3.0). ScummVM's Mohawk engine runs The Manhole's original HyperCard data files. https://github.com/scummvm/scummvm