Mini-IAMOND RING™ by Kadon

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Nine easy pieces—shapes made of 2, 3, 4 and 5 equilateral triangles joined—fill the encircled pattern and form a large variety of shapes outside the ring, too. For the toughest cha llenge, have no two of the same color share sides. A computer search by Bill Cutler proved that only 2 solutions meet this condition...out of the 15,140 different ways to fill the circle! We had offered this challenge as a contest for the International Puzzle Party in 1997, and Bill's findings won the prize. All acrylic, five-color mix in a 5½" tray. For 1 or 2 players, ages 6 to adult. Show more