600 puzzles of sudoku

Considering the last negative reviews we wanted to correct the sudoku puzzle because it was considered too easy. concentration;-Stimulates logic and memory;-Develop problem solving skills;-It reduces negative thoughts and anxiety;-A gym for your mind. For this reason it is suitable for . You don't need to be a math genius to solve these puzzles!- is printed in a large 8.5x11 inch format, to avoid excessive strain on the eyes and to fully enjoy sudoku;- has 201 pages with 600 easy to difficult sudoku puzzles with solutions in the last pages.