SUPER SUDOKU NO 481

Test your mental agility with our giant Sudoku and you could win a £100 cash prize PLUS a Super Sudoku book!

Each row, column and 4x3 box must contain all the numbers 1to12. Call 0906 650 2199 for extra tips (60p per minute from BT landlines).

The Mail on Sunday Book Of Super Sudoku is published by Hamlyn at £5.99. Buy it for £5.49 with FREE P&P from Mail Book Shop through mailbookshop.co.uk.

The winner of Sudoku No 478 is Valerie Mellor, of Northwood, Greater London.