"The Su Doku craze is still as strong as ever with Wayne Gould as the leading authority on this worldwide puzzle sensation, having sold over 6 million Su Doku titles worldwide. The original creator of The Times puzzles, Wayne Gould is the leading authority on Su Doku and is the man responsible for transforming this Japanese number puzzle into a worldwide phenomenon. Gould's success resulted in him being listed as one of Time magazine's most influential people in 2005. This elegant slipcase contains all four books in the Su Doku Medal series - from Bronze (Easy) and Silver (Mild) to Gold (Difficult) and Platinum (Fiendish). Each book contains over 150 previously unpublished puzzles. Testing your brain power and stamina to the limit, completion of all four will bring you to the finishing line and confirm your status as a Su Doku champion."