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Test your code-cracking abilities with 300 of the Telegraph’s most addictive puzzles.

How does it work? Well, each grid contains numbers that correspond to a letter of the alphabet. With the help of a few solutions to start off, all you’ll need to do is complete the puzzle by working out every letter’s respective number.

The perfect mental workout and screen-free activity, The Telegraph Big Book of Codewords 1 will provide hours of entertainment, whether you’re at home with a cup of tea or passing the time on a long commute.