Save up to 35% on selected puzzle books

IF you’ve had fun testing your knowledge with our new-look puzzles, why not take advantage of this fantastic puzzle books offer? Readers can save up to 35 per cent on selected titles from the Mail Book Shop, and get free delivery for a limited period.

Challenge yourself or play with friends and family. This selection of puzzle and trivia books will not only keep you entertained, it will also keep your mind active.

Think you can recognise changes made to what appear to be identical pictures? In Extreme Spot The Difference, each carefully chosen photograph has been modified with no fewer than 50 subtle and ingenious changes – but can you find them?

Ever wondered how many potato crisps really exist? Whether any spot on Earth is still unexplored? And why a spatula is orbiting the planet? Listomania covers questions on human behaviour, trivia facts about geography, etymology, mythology, ancient and recent history, as well as pop culture. Keep Calm And Sudoku On is a paperback full of the fiendish number puzzles that will keep you occupied for hours. And the Chambers Complete Crossword Companion is designed for fanatics of all ages and abilities. You’ll find advice and word lists to help you solve even the most difficult of clues.

HOW TO CLAIM

Join or sign into your account at mymail.co.uk.

Enter the Unique Number from the back page of today’s Mail on Sunday.

Redeem the promotion by Thursday, January 29 – there’s no need to spend any Mail Points.

A link to your offer and instructions on how to claim will be emailed to you within 24 hours.