Shanghai

A simple darts game for multiple players or teams.  The winner is the player with the highest score after 20 rounds or the first player to hit a Shanghai ie. hit a single, double and triple of the target number, in any order.  Players take it in turns to throw 3 darts with the aim of achieving the highest score.  Hitting the thin outer doubles ring counts as twice the number scored, hitting the thin inner triples ring scores 3 times the number.