A handy pocket-sized pad that includes 200 sudoku puzzles ranging in difficulty from hard to very challenging.
A handy pocket-sized pad that includes 200 sudoku puzzles ranging in difficulty from hard to very challenging.
Perfect for sharpening concentration and reasoning skills, here are 200 all-new Sudoku puzzles that build in difficulty level from hard to very challenging. A musthave for every on-the-go Sudoku sleuth!
Zachary is a programmer and professor of biophysics at Columbia University, U.S.A.
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