WIN £100

The Mail on Sunday Book of Super Sudoku is available at a 20 per cent discount, £5.59. Order at mailbookshop.

co.uk, or call 01603 648155. P&P free.

The winner of Sudoku No 870 is David Brewer, of Bordon, Hampshire.

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, April 19.