Thanks Germanunkol, i was thinking about the puzzles, there will be certain "artifacts" or objects that have to be collected, and the portal is set up in a way that you have to use those artifacts/object found on each level in order to activate it. i am still thinking this through. we can also think outside the box, it might not have to be just objects that have to be found, but clues and the way a rooms objects are set up may be the key, and you will have to re-arrange the items or furniture in that room to activate the portal. i dont know, this can be really exciting if we do it right, and a fun game to play.