ok, i have read all [most] of this thread and i saw the theories about the movie national treasure and the counterweight idea. I saw the movie tonight and thought i would put in my two cents: (this may or may not spoil the movie for you, its not that important though)
near the end there are
four characters who have to stand on the corners of a giant wooden
square that is balanced on a giant spike. They have to move around to keep the square balanced, and then they have to move together to try and raise up a corner so the guy could reach a suspended ladder.
Im not sure if i totally believe in the theory connecting the clue to national treasure, but if its true I would say that there would be something like that in the game, maybe four robots (using IR) that have to balance on a square in the center for the endgame.
Thats just what i think, its probably wrong though but just putting it out there
