250 Sudoku Puzzles: Hard to Very Hard Sudoku Puzzles (Sudoku Collection)

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
• | Publication Date: Sep 10, 2018
• | Number of Pages: 144 pages
• | Language: English
• | Binding: Paperback
• | ISBN-10: 1727195612
• | ISBN-13: 9781727195613