Math and Logic Puzzles That Make Kids Think! : Grades 6-8, Paperback by Wanko, Jeffery J., ISBN 1593634161, ISBN-13 9781593634162, Like New Used, Free P&P in the UK

In Math and Logic Puzzles That Make Kids Think, the authors present several variations on Sudoku—the most well-known type of logic puzzle—in an easy to use, exciting format perfect for any math classroom.