It's hard to show but the grey bars are placed on the edges of the rooms, moving from one long thin room to a tall thin room. This movement/placement is based on the position of the orange box, so it should in theory work anywhere, as long as the two boxes are the same size

Managed to make a transition object that carries player data between two rooms and applies it to the player object in the new room. Very basic, needs a lot of work, but the basic idea is there

I regret some of my decisions (music not mine)

#GameMaker