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THE BEST SUDOKU: Every puzzle in this calendar is created by Nikoli, the best Sudoku makers in the world--not a computer--to balance toughness and solvability and keep you hooked.
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TRAIN YOUR BRAIN: The week begins with the easiest puzzles and the difficulty increases day by day. Just in case you need them, solutions are printed on the back of the pages.
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NOW PLASTIC-FREE!: Page-A-Day(R) Calendars are environmentally friendly! Printed on responsibly sourced paper and 100% recyclable, with sturdy cardboard backers.
ISBN-10: 152352961X
ISBN-13: 9781523529612
Author: Editors of Nikoli Publishing, Workman Calendars, N/A
Publisher: Workman Publishing