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A very quick and easy dart game that's great for practice.  It can be played with any number of players and the winner is the first player to hit every number from 10 through 20 with one dart and in order.  Players take turns to throw 3 darts, trying first to hit 10, moving on to 11 etc.  If a player misses a target number with all 3 darts, that player slides back a number.  So, if they were trying to hit 11 and missed with 3 darts, on their next turn the target number would go back to being 10.