More than 200 variations of the world's favourite puzzle have been created to test your Sudoku skills. The revered intelligence organisation, Mensa, have worked with Gareth Moore to put together a supreme test of logic. These brand-new puzzles will provide hours of entertainment for anyone who enjoys mental gymnastics. As well as traditional Sudoku, many varieties such as Samurai Sudoku and 3D Sudoku have been included to provide a further stern examination.