Author Description

Sudoku is a mathematical game that uses logic, invented in the late 1970s. These puzzles are of great help to the brain, because they motivate to search for the answer with concentration, logical reasoning and using memory more effectively. Sudoku is usually done on a 9x9 grid, it is also divided into "blocks", also called "boxes" or "regions". Some cells already contain numbers, known as "given numbers" or "clues." The rules of the game are simple, you must fill in the empty cells, with a number in each of them, but each column, row and region must only contain the numbers 1-9 once. * This book contains 90 sudokus, 6 on each page divided into 30 medium level and 60 hard level. * Include in the final part the solutions to all the problems in this publication. Issue # 1 weekly.