400 amusing Numbricks classic puzzles + bonus 1n 250 Maze 25 x 25 very hard levels (bonus puzzles need to be downloaded and printed). The way to mastery of Sudoku 400 unique Sudoku puzzles. Fitness for your brain. Original Sudoku for the power of your brain. Just tested puzzles. Answers at the end of the book. All riddles have only one proven solution. Good mind support in the excellent form. Develops memory, logical thinking, helps to focus. Creative possibilities expand. Ideal gift for all fans of puzzles. A great book for free time and studying the mind. I hope you enjoy the book. I would really appreciate it if you write a review. Best regards, Basford Holmes