Pocket Sudoku: Level Expert 100 Puzzles

Sudoku keeps your brain logical thinking, even at a young age. Sudoku improves critical thinking and making quick decisions based upon available evidence.

Sudoku is not only fun and interesting. It is a brain game that helps to train the brain of you and your child. Sudoku also demands attention to detail - noticing patterns and finding the right moment to make a move.

This series have four different levels: easy, normal, hard, and expert. This book is easy level.
if you need other level, ple...