Just completed game, last dungeon k last night very difficult but not impossible on this excellently playable game. You basically collect the three red keys first then use two of them to get green key. You need a red and green key to open door to exit! Move around dungeon in clockwise fashion. I left my XE on for three odd weeks to complete it, was great feeling to finally complete it ! I wont spoil it and tell what happens once you complete it! I completed it with a Saga controller v good for fine control you need.