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.

Product Information:

• ISBN: 9781789508864
• Author: Ivy Finnegan
• Publisher: Arcturus Publishing
• Format: Paperback
• Pages: 128
• Dimensions: 12.9 x 19.8 x 1cm