Details: Sudoku is a number placement puzzle and it can be solved with reasoning and simple logic. Inside this book you will find 111 puzzles with four levels of ability including easy, medium, hard and very hard.Please note - Colours and designs may vary, only one supplied. Ideal for: This book will appeal to all puzzle lovers and is ideal for taking with you on holiday or on your way to work on the daily commute. This paperback book has 140 pages and measures: 21 x 14.5 x 0.8cm.