2 Ideas here
1st:
A room with much little rooms inside. In every room is a button, which opens different doors. You need to press the correct buttons to find the finish.
A harder way: The "G" (finish) moves if you press a button. So it's harder to get it, because you need the correct door.

2nd:
A room, nearly like the one in my 1st idea, but there aren't buttons and doors. The doors will be teleporters now. The red line marks a walkable way (your choice how it's the correct one

) If you walk this way, the NEXT teleporter will be disabled, if you passed it, it will be enabled and the next will be disabled and so on..
(im zweifel nochmal nachfragen

)
