In the level "Tomb of the Ancients" in Rayman 2, if you stand outside the door that leads to the boss fight and face the door while quickly pressing "playjeff" on the PC version, a crate will spawn and you will be able to enter use the crate to enter a square hole high up on the wall. You will then be in a small tunnel with three signs with cryptic messages on how to renew your health and gain stronger power ups. At the end of the tunnel is the scene in the image.
