The perfect gift for the computer nerd or geek in your life. 150 Sudoku 16x16 puzzles Far more challenging than traditional 9x9 Sudoku 16 hexadecimal characters in each puzzle Large 8.5" x 11" pages make it easier read 2 difficulty levels - 'User' and 'Nerd' (Nerd level is hard!) A great gift for a birthday, at Christmas, for coworkers or family and friends!
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