Sudoku Puzzle Book 5: 400 Extreme (Very Hard) Sudoku

Sudoku (also known as "Number Place") is a placement puzzle. The puzzle is most frequently a 9 x 9 grid made up of 3 x 3 subgrids (called "regions"). Some cells already contain numbers, known as "givens." The goal is to fill in the empty cells, one number in each, so that each column, row, and region contains the numbers 1 through 9 exactly once. Each number in the solution therefore occurs only once in each of three "directions," hence the "single numbers" implied by the puzzle's name.

Author: Mindful Puzzle Books
Publisher: Createspace Independent Publishing Platform
Published: 04/13/2018
Pages: 232
Binding Type: Paperback
Weight: 0.70lbs
Size: 9.00h x 6.00w x 0.49d
ISBN13: 9781987782936
ISBN10: 1987782933
BISAC Categories:
- Games & Activities | Sudoku

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