Backflip!

This solo game has the shortest rules ever written. The goal of the game is written on the title: Backflip! During his turn, the player throws the eraser in order to do a backflip with it. If the eraser does a full rotation and it lands showing a smile on the face, he wins. If the player fails to complete a full rotation with the eraser or doesn't land showing a smile on the face, he loses.