/vr/ - Retro Games

Secret worlds in Metroid are what happens when you bypass the loading trigger and the game starts using room layouts for one area in another area.
As an example, here's what the entire game map looks like when using only Brinstar's rooms.
There's no way to use the password system to load in an area with another area's layouts active. It's not a function the password system even handles in the first place.