Just before the baths section of the game there is a large doorway you have to pass through boarded on either side by cliffs. By wall jumping between the endge of the door and the cliff you can end up on top of the door. Once there if you wall run to the right you will end up outside of the level. From here three things may happen, one you will be stuck in the falling animation until the prince dies, two you will simply fall out of the level into the void, or three very rarely you will be able to jump back into the level and look through the doorway into the void where there should be a tunnel.

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