400 NUMBRICKS puzzles 9 x 9 + BONUS 250 LABYRINTH 25 x 25: Sudoku with EASY, MEDIUM, HARD, VERY HARD levels puzzles and a Labyrinth very hard levels

400 amusing numbricks classic puzzles + bonus in 250 Labyrinth 25 x 25 very difficult levels (bonus puzzles need to be downloaded and printed). The way to mastery of Sudoku! The puzzles will lead you from the light level to the super heavy. 4 difficulty levels (all difficulty levels). 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 excellent form. Develop...