Let's challenge your Brain! Book features: Over 1200 puzzles difficulty level medium for adults. - Hours of fun and improve your brain activity. - Includes solutions for every puzzle at the end of the book, in case you get stuck. - A good companion for morning coffee, your lunch break, a rainy Sunday, and vacations. - Standard grid size for a book with 12 puzzles on each page. - Easy to tear out, thanks to wide margins. - Great gift ideal for lovers of Sudoku.