Homewelcome to Christian Demarco's Puzzle BooksRecently Published Quality Puzzle Books With Realistic Difficulty Levels Sudoku-X Pocket Book 100 Easy Puzzles Sudoku-X Pocket Book 100 Medium Puzzles Sudoku-X Pocket Book 100 Hard Puzzles Jigsaw Sudoku-X Pocket Book 100 Easy Puzzles Jigsaw Sudoku-X Pocket Book 100 Medium Puzzles Jigsaw Sudoku-X Pocket Book 100 Hard Puzzles 400 Easy Jigsaw Sudoku-X Puzzles 400 Medium Jigsaw Sudoku-X Puzzles 400 Hard Jigsaw Sudoku-X Puzzles Sudoku Black Book – 200 Extreme Puzzles