Put your math skills to the test with these 300 number puzzles, organized into 50 easy, 225 medium, and 25 difficult puzzles. Mega Sudoku offers mega fun and satisfaction, plus science-backed benefits to your cognitive function, memory, and mood. This beautifully designed puzzle book features: 300 sudoku puzzles, providing hours of brain-sharpening entertainment A range of challenge levels, from easy to difficult Layflat format that keeps the book open while you solve Take a break from the screen, unwind, and get your mind in shape with this giant volume of sudoku puzzles.