Really, really stuck. Above the Tunnel there is A Cave that has a big gray square on the floor with white blinking lights. You can turn them off or on depending on which way you walk across the square.
There is another cave with yellow squares on each side of the cave that also has the white blinking lights.
Also there is a cave where you cross a small bridge over water and the sign says: Here lies Richard the Puzzler whose last words were, Make a ring you dumb@ss
What do I do in these caves?