Darts is a sport in which small missiles/torpedoes/arrows/darts are thrown at a circular dartboard fixed to a wall.I love to play darts on weekend.Due to the time and difficulty,I designed it to five kinds of score ,including 0,10,20,50(outer bulls eye) and 100(inner bulls eye).If you throw it with too much speed,it would be detected to 0, means that one fails to stick on the wall.So, it is a challenge game.