Knucklebones was played during medieval times, though it actually originated in the days of ancient Greece with records of the game dating as far back as 330 B.C.
The game features four bones, each taken from the ankle of a sheep, with each bone possessing four sides, each of a different shape. Each long side —- convex, sinuous, flat and concave, respectively —- is given a different value, typically 1, 3, 4 and 6. Players roll the bones like dice, and add together their score for the round based on which side of each bone lands facing upwards. If bones aren’t available, the organizers could substitute them for a set of four-sided dice.