Each player progresses around the clock from 1 through 20. At each number he throws three darts. The aim is to score as many points as possible in each segment with three darts, doubles and triples counting. The highest accumulated score at the completion of all twenty segments decides the winner.
Any number can play.
Only the numbers 1 to 7 are used. All three darts are thrown at each number in turn and the highest possible score amassed. Doubles and triples count their usual values. The top score after seven throws is the winner. There are three hazards to make things more interesting.