there could be a random dungeon creator, or just a random puzzle creator, and maby even a boss chosen out of a list of bosses for that level dungeon, it could be worked out so that the fun keeps comeing for a long time
oh and there would have to be a way to keep people from coming into the dungeon while your doing it and be able to just walk trough couse you killed all the enemys and finished all the puzzles WITHOUT stopping it from being a one person only thing (so you can bring some friends along), maby make the door open and once someone goes trough a timer gets set, once the timer stops the door closes and stays closed untill the person(s) inside finish the room and goes on OR thay turn back and go back into the previuos room, also there should be a room before the boss where you can heal and stuff in preperation for the final battle, all of this is most likly makeable, and would add something fun for people of all levels