Sudoku Challenge: Over 600 Puzzles

This huge spiral bound collection of Sudoku puzzles will keep even the most avid puzzler occupied for days as they work to solve the trickiest puzzles. A terrific gift for any puzzle-lover, this book contains over 600 Sudoku challenges.
Sudoku, which means "single number" in Japanese is a logic- [...]
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This huge spiral bound collection of Sudoku puzzles will keep even the most avid puzzler occupied for days as they work to solve the trickiest puzzles. A terrific gift for any puzzle-lover, this book contains over 600 Sudoku challenges.
Sudoku, which means "single number" in Japanese is a logic-based game, with the objective being to fill a 9 x 9 grid with digits so that each row and column, and each of the sub-grids that compose the grid, contains all of the digits from 1 to 9. Sudoku was popularized in 1986 and originated in Japan.