Curvy shapes of 1, 2, and 3 "rounds" and "bridges" fill the 5.75" acrylic tray in countless colorful ways. This puzzle has been one of our bestsellers since 1983. The illustrated booklet includes many variations for ages 5 to adult as well as rules for 3 games for 2 players. We offer Roundominoes in seven color choices. $26

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43 acrylic pieces of 1, 2, 3 and 4 "rounds" and "bridges" fill a 10x10 grid. The hefty booklet includes over 200 puzzles (some of these are the most difficult we've ever dreamed up) and rules for six competitive games. The scalloped-edge black tray is 8½", with pieces in jewel-like colors. The separate game grid is useful for both the games and the puzzles. Playable by 1 to 6 players, ages 12 to adult. $55

This one's the grandfather of the Roundominoes series. It has 83 pieces, including 1 through 5 rounds, 1 through 4 bridges, and 8 new shapes called doopers, that are like double rounds with extra bridges. [We named them that because this set was designed at the urgings of a young friend, Cristopher Kiddoo, who wanted a "super dooper" version of Roundominoes. The doopers are sort of funny little cartoon figures with droll names.] Even we don't know yet how many different ways the set can fit. The 16" tray, black or white, is supplied with reversible black/white fitted lid and easel. The pieces are made of 7 luminous transparent colors, plus black and white accents. Recommended for teen and adult puzzle lovers. $175