- A generic entrance chamber with some plot explaining the scenario and some basic equipment perhaps.
- Three exits from said chamber, one to the evil floor(s), one to the good floor(s) and a central (barred) exit going down to the 'final area', which might be 1-4 rooms?
- You have to complete, say, 16/20 rooms in order to go into the 'final area'. Each room could result in getting a 'good' or 'evil' item / spirit / something to help in 'the final battle' (or puzzle).
- If you complete them all, you get extra bonuses to take on the final room / kudos for finishing all rooms.
- The layout would be predefined with all rooms being between 6x6 and 9x9 say, but you could then 'fill in' the spaces in your room to make a more complex layout.
Of course, just my opinion - I'd love to take part no matter what options we go with!