! Sudoku is the best puzzle game for fun and education!By solving Sudoku puzzles, you can spend your free time without noticing and also train your brain and logical thinking. The more you play, the more you will enjoy Sudoku.In fact, according to research, Sudoku has many benefits for players. Some are as follows:the free time occupied healthily, helps logical thinking, improves memory and concentration, stimulates the mind, reduces the risk of dementia.Over 400 Sudoku puzzles on four difficulty levels:EasyMediumDifficultVery hardThis book includes solving techniques for each difficulty level, as well as solutions at the end.This book is the perfect gift for anyone looking for relaxation and fun at the same time.Keep your brain young!Sudoku book features:Large format 8.5 "x11"Premium glossy cover design4 puzzles on each pagePrinted on high-quality paper