EXERCISE and LEARN with this game used by everyone.The book contains sudoku exercises of different levels, designed for children between the ages of 6-9 who just start playing it at the beginner level, and want to advance to levels to become experts.BENEFITS: - Has fun learning.- Lessens your anxiety.It- Very good for beginners.- Improves concentration.THIS BOOK INCLUDES: -Levels easy, médium, and hard.-2 grid sizes (4x4 y 6x6).-84 exercises to solve more.-45 pages.-Size 8.5″ x 11″ (A4 22 x 28 cm.).I invite you to the Beat the game challengeMay each time be worthwhile.