Go to level creator and make a level where a monk is trapped in a hole. Put a line of invisible ladders along where you want to walk just above the monk's head. Complete the rest of the level as desired or just add a treasure, an exit door, and a player and save the level. Go to where you can play the level you just made. Get on the monk's head. Start to walk off his head. You should keep walking, even though there is no land to walk on.