Seven Stones is a traditional Indian game, boasting of a special place in the Indian Culture, spread over a wide region even today. It is described in detail over here - http://www.traditionalgames.in/home/property-games/seven-stones-elu-kallu.
The touch version of this game is a very simple version of the above game. The goal is to hit and make all stones fall down. The catapult used to throw the ball controls only speed and not the direction. So precise positioning is of the ball is required.