Challenge your brain, have a fun time, and fight the boredom with the mega Diagonal Sudoku challenging puzzles. This Sudoku activity book includes 120 puzzles of 16x16 Sudoku X from Hard to Extreme with instructions, examples, and solutions. Plus Bonus Puzzles of a different type of Sudoku at the end of the book. What is 16 x16 Diagonal Sudoku X puzzle? 16 x16 Diagonal Sudoku X has 16x16 squares. Each row, column, Diagonal cells, and block (surrounded by bold lines) should contain all numbers from 1 to 16 No number is repeated in any row or column or block or in a diagonal line. Why will you love this book? Scientific research has shown that solving logic puzzles as Sudoku keeps your mind sharp, improves memory, and enhances problem-solving skills. 16x16 Diagonal Sudoku X book has four challenging levels, from Hard to extremely hard. One Puzzle per page in a large font makes it easy to read and will not strain the eyes. Wide margins for your calculations and work to solve the puzzles. Plus the solutions to all the puzzles included at the end of the book. BONUS Puzzles: 6 Diagonal Samurai Sudoku Puzzles. Features: Size: 8.5x11 inches (large size) with softcover and paperback binding. Pages: 155 pages with 120+ different puzzles and the solutions of all the puzzles at the end. Imagine the fun and challenging hours you'll spend solving these challenging puzzles! Scroll up and order your copy.