Castle

This is a game for any number of players in which the winner is the first player to build their castle ie. check off a total of 15  boxes from a 5 x 5 pyramid.  To start, each player throws a dart with their wrong hand to set a random target.  The number hit becomes that player's target for the game.  Each player then takes it in turns to throw 3 darts, either at their own target in order to check off boxes and to build their castle, or at an opponent's target to knock pieces of the opponent's castle.  In both cases, hitting the target counts as 1 box, the doubles ring as 2 and the triples ring as 3.