During level 1 when you get the first key, go through the first gate. You will see groups of ants marching. After allowing them to see you, roll up to a wall of grass on the side of the land. Let the ants hit you and, if you are lucky, you will fall through the wall and get on the other side. There will just be a path going around the border of the land. In the background you will see faces. Eventually the game will return to the menu screen.