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No two players can have the same number.

The double-20 is often referred to as double-top, reflecting the 20's position on the dartboard.

The winner is 'the last man standing'.

It was more durable and required little maintenance.

Another version of "Killer" is a "knock-out" game for three or more players the more the better.

BDO darts.

In the game, the frequently announces a score of 180 in exuberant style.

If they do that they win the leg and the first to three legs wins the set.