Challenge your skills with 400 Sudoku X puzzles ranging from Medium to Hard levels. Also known worldwide as Diagonal Sudoku, Sudoku Diagonale (French), Diagonales Sudoku (German), and Diagonaal Sudoku (Dutch), these puzzles require filling every row, column, box, and both main diagonals with the digits 1 to 9 without repeats. This book is ideal for intermediate to advanced solvers who want to boost their logical thinking and problem-solving abilities. Inside, you'll find a clean 9x9 grid, 2 puzzles per page , and solution pages at the back for easy checking. Enjoy Sudoku X in sharpen your mind with a true challenge. Unlock new strategies and test your brainpower with this international collection, perfect for puzzle fans across the globe.