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• No pencil nor paper required. Made of beech wood, 81 thinking tiles. The best way to train brain. 2 spare tiles per number included.
• Comes with a booklet of 100 sudoku puzzles.
• Two spare tiles per number (in a bag) all fit neatly into the drawer; Each tile is double-sided, black for numbers you're sure about, red for possibles.
• The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 subgrids that compose the grid (also called "boxes", "blocks", "regions", or "subsquares") contains all of the digits from 1 to 9.
• Makes a great board game gift for number-puzzle lovers.