The Times Su Doku Book 4: 100 Challenging Puzzles from the Times

The fourth collection of the best-selling Times Su Doku puzzles,with exclusive “Alpha Doku’ letter puzzles.

The Times Su Doku Book 4 includes exclusive "Alpha Doku’ LETTER PUZZLES

5 Easy Puzzles 30 Mild Puzzles 5 "Alpha Doku’ Letter puzzles 40 Difficult puzzles 20 Fiendish puzzles

For those still in the dark, Su Doku is a number grid consisting of 9 large squares each divided into 9 smaller squares. You must complete the grid so that every column, every row and every 3x3 box contains the digits 1 to 9.

Wayne Gould, 59, is the brains behind this new craze. Now retired, he was a High Court judge in Hong Kong.

People everywhere are crazy about Su Doku. Find out what all the fuss is about by having a crack at The Times Su Doku, the original, the best and the market-leader.