Go to the Egyptian level. Now get to this area where there's lots of alcoves in the wall. Go to the first alcove. You won't be able to walk through the wall at the chameleon's right, but your tongue will be able to go through. Maneuver your tongue around, through the wall, and then to the back wall. Your tongue will drag you through the wall and then back to the alcove, like nothing happened.
Submitted by: kornyhatemachine