The Mail on Sunday Book

of Super Sudoku is priced at £6.99. Order at mailshop.co.uk/ books, or call 0844 571 0640. Free P&P on orders over £15. The winner of Sudoku No 821is Ernie Bogg, of Maltby le Marsh, Lincolnshire.

TO ENTER: Text SUPER followed by a space, your 3 shaded squares, reading left to right, name and postcode to 65700. Texts cost £1 plus your standard network charge. Or call 0901 292 5050 and leave your answer and details. Calls cost £1 plus your telephone company’s network access charge. Entries will be accepted until 11.59pm on Friday. See today’s solutions panel for terms and conditions. This week’s solution will be published next week and the winner’s name on Sunday, May 12.