Mega Sudoku 16x16 Grid: 300 Large Logic Puzzles, Medium Difficulty, Volume 1: Riddles, Naicsa's: 9798840398203: Amazon.com: Books
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Sudoku Mega Bundle by GammaLateral LLC
Mega Sudoku 16x16 - 200 Normal Puzzles vol.2 (Paperback) | Books and Crannies