OK, I finally found the manual last night. Here's the deal. Apparently there are *9* puzzles that you have to complete. The room with the empty doorway is the entrance to the lair, and the room with the checkerboard computer gets you free passwords (lift resets or snoozes). Also, everytime you use the phone, it costs you 2 minutes, and every time you die you lose 10. 6 hours total.