A year of Sudoku puzzles hand-crafted by Nikoli, the Japanese company that invented the game.

• 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.
• 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.
• ​PLASTIC FREE: Printed on responsibly sourced paper and 100% recyclable.