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 Mindful Puzzle Books

Publisher: Createspace Independent Publishing Platform

Publication Date: Apr 13, 2018

Number of Pages: 230 pages

Language: English

Binding: Paperback

ISBN-10: 1987782933

ISBN-13: 9781987782936