Just ran Tears of Itlaocol again today since I was in the area, but nearly could not finish. The lighting inside the cave was so bright, it flooded out the face with the patterns on it. I and one other person finished it only by going though all the possible known combinations until things ‘clicked’.
Yay, for waving dead chickens at monitors…. >.<
Also, what’s up with the inviso-wall at the end past the door, forcing you to Way Point out?