Elma is based on a real physical model, but to be honest, the physics could as well be from another planet. In the game, you have to complete various levels by collecting all the apples as fast as possible and finish the level by touching the flower. The basic idea of it is very simple and Elma might sound a bit boring, but it’s definately not once you get the hang of it. People are either big fans of Elma, or despise it for being a waste of time. Maybe it's just the simple idea which makes the game so addictive, or the very dedicated community that has developed in the time passed after the game was released.