You start with 420 Points.
Goal of this game is to reduce your score to 0 er less. You aim 3 darts at every double on the dartboard, from D1 to D-Bull, and minus the score of
succesful hits that you have off the score of 420 (i.e. if you hit 2 double 1's you take away 4 from the score of 420 leaving you 416).
If your score greater then zero after D-Bull, try again. The score will be stored as your best, till you finish the game with less than 63 darts.