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 See also the 25 Holes Challenge. You may win a silver dollar! Vee-21TM This sweet and innocent-looking set of 21 V-shaped trominoes (3 squares each) can entertain a four-year-old with simple patterns, yet infuriate a grown-up expert with tough challenges. Math professor Norton Starr originally commissioned this set to demonstrate proof of a theorem—that an 8x8 grid can be filled with V-trominoes no matter where you leave the empty space. We coupled this puzzle with a color-separation feature, then added an original concept by Oriel Maximé, of filling the Vs on grids around strategically placed barricades. The 28 "Bends" layouts cover four levels, from Easy to Expert. Other challenges and game rules are included. A feature discovered later and added in the second edition of the book is a pretty alphabet. All acrylic, 7 tiles each of 3 luminous transparent colors in 7" tray with engraved grid lines. You can choose from three color combinations. Ages 4 to adult, 1 or 2 players. \$42 Add to your order

 SEXTILLIONSTM 36 acrylic pieces include all the shapes of 6 squares joined ("hexominoes"). Each piece has a name. They are sized to be compatible with Poly-5, for those who want the extra excitement of combining the whole series. The 8˝" tray and game grid accommodate four strategic games and hundreds of puzzles. Sextillions is available in several color combinations. For its 25th anniversary in 2009, we gave it a frosted silver frame and center, and a special "25" solving challenge (.pdf, opens in new window). Suitable for 1 to 6 players, ages 12 to adult. \$65 Add to your order

 TRIANGOESTM JR. ...from an idea by Manuel Garcia This 15-piece two-color set continues to delight us with its variety of shapes and color symmetries, even years after we originally explored it. The all-acrylic, handfitted tiles are one and two right triangles in size (one sample shown), with plenty of puzzles both in and outside of their 8˝" tray. Choose from 6 color mixes. For its 25th anniversary in 2012, we added a touch of silver. Suitable for 1 or 2 players, ages 8 to adult. \$65 Add to your order