Count down to Christmas with the ultimate daily brain challenge!From December 1st to December 24th, the Sudoku Advent Calendar 2026 (Hard Edition) offers six new puzzles every day – 144 challenging Sudokus in total.Each daily set features three demanding difficulty levels: Hard, Very Hard, and Extreme. Designed to test logic, concentration, and problem-solving skills, these puzzles provide a rewarding mental workout during the busy holiday season.The clear, easy-to-read layout and festive design make this Christmas Sudoku book ideal for experienced players, ambitious puzzle fans, and seniors looking for a real challenge.Features:• 144 challenging Sudoku puzzles• 6 new puzzles every single day of Advent• Difficulty levels: Hard, Very Hard & Extreme• Large, easy-to-read format with solutions included• Festive Christmas layout• Perfect holiday gift for adults and seniorsGive the gift of daily puzzle fun or challenge yourself this December. Grab your copy today and start your countdown to Christmas!