"Throw" the given number of darts onto the dartboard. Each dart must be thrown into a numbered region, and no two darts can be thrown into the same region. The sum of the numbers in the regions with darts must add up to the specified target score.
(Rules and example from PGP IB)
- Multiple hit within same region are sometimes allowed.
History of the puzzle
"Archery Puzzle", described by Sam Loyd (USA) in 1914 uses the same rule. In this puzzle, number of darts was not given and regions could be hit multiple times.