It may be a while before your tiny tyke becomes a pro at Sudoku, but these knobbed puzzles from Kid O make it easy for burgeoning problem-solvers to put the right pieces together. Made from sustainably harvested wood and nontoxic paints, the puzzles are designed to help children hone their shape- and color-recognition skills, whether it’s through matching up a litter of cats or reuniting a passel of barnyard animals.

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