Every puzzle in this page-a-day, desktop calendar is created by Nikoli, the best Sudoku makers in the world—not a computer—to balance toughness and solvability and keep you hooked. Each 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 each page.

Printed on responsibly sourced paper and 100% recyclable, with sturdy cardboard backers.

Measures 5.5" x 1.5" x 5.5".