400 Calcudoku Medium - Hard Puzzles 9 X 9 + Bonus 250 Classic Sudoku

Prepare your mind for an exciting excursion to the world of numbers. Prepare a pencil and mood This is a mathematical and logical puzzle. It is necessary to fill the grid with numbers so that in each line and in each column they are not repeated. The number in the corner of each selected block is the result of an arithmetic operation on the digits in this block. The numbers inside the block can be repeated. The puzzle can be called Square Wisdom, Kendoku.- 400 amusing classic puzzles + bonus in classic Sudoku 9x9 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 Holme