See also:

Stelo

• Mini-Iamond Ring
• Iamond Hex
• Iamond Ring
• Octiamond Ring
• Hexnut Jr.

• Hexnut
• Hexnut II
• Rombix Jr.
• Rombix

• Rainbow Rombix
• Roundominoes
• Super Roundominoes
• Grand Roundominoes

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 challenge, have no two of the same color share sides. A computer search by Bill Cutler proved only 2 solutions meet this condition—out of the 15,140 different ways to fill the circle! We had posed this question 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. $23

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Memory matching game

9-piece "Hexa" challenge

Very difficult! Twelve pieces made of 6 equilateral triangles joined ("hexiamonds") fill the circle and can make hundreds of other symmetrical shapes outside the tray, too. This pattern can exactly fill the center hole of the Octiamond Ring below (thanks to Ed Pegg, Jr. for pointing this out to us). Toughest challenge:  have all pieces of the same color connected, or separated. Aad van de Wetering proved by computer that each of these conditions has only one solution — out of the 55 possible ways to fill the 5½" tray. Other challenges involve making 3 congruent shapes. Here's a solution done in needlepoint. All acrylic. For 1 or 2 players, ages 12 to adult. $21

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Shapes of equilateral triangles joined are known as "polyiamonds". Iamond Ring contains all the shapes from 1 to 7 unit triangles in size, in an acrylic hex-ring tray, 8½" square. It has a fine repertoire of forms and themes. The instruction book is still "under construction." For 1 to 4 players, recommended ages 12 to adult. $55

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The 66 different shapes of 8 equilateral triangles joined ("octiamonds") fill a large hexagon with symmetrical center space. This elegant solution is by Andrew Clarke. We make these in transparent tinted acrylics in 13½" black trays with reversible lids. They're sized to the regular Iamond Ring so you can explore combining them. The center gets filled with the 12 hexiamonds in clear, white or black, for a nested challenge. There'll be a rulebook by and by. For only the most profound pursuers of pulchritudinous perplexities. $150

Shapes made of hexagons joined are known as "polyhexes." Hexnut Jr. is a small hex ring with all the shapes of one to four hexagons in size, plus a selected quartet of fives. Its booklet is full of variations and other puzzle shapes to solve. Symmetry shapes abound. Here's a group of tetrahex figures with symmetrical solutions done in needlepoint. The game for two players is unusual in that the two players pursue different objectives. All acrylic with 7" tray, in five color choices. Suggested for ages 8 to adult. $32

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