Players share a pool of identical dice, each face of which shows a component of a Celtic knot work design. Each player starts with one die placed in their design. On each turn a player rolls one dice for each player, and adds one of those dice to each player's design. Designs are constrained to fit inside a 5x5 grid. When no more dice can be placed the game ends, and the player who has the single longest path with the most crossings wins.
Osbo may be played on-line at gamerz.net:
Full details are at the designer's web site: