Are you a black belt in sudoku? Give your mental muscles a real word-out with this puzzle-tastic book, which will train your brain while you're having fun. Thanks to all these nifty number puzzles, you'll be a sudoku whizz in no time. With puzzles divided into easy, medium and hard, this is perfect for puzzlers aged 7 and up.About the seriesAre you ready to level up your little grey cells? The Brain Power series brings a sense of fun and energy to logic puzzles that are designed to make the most of your mind! The activities in each book will help children to improve their sustained concentration; lateral thinking skills; and focused problem solving abilities.