ALEX Bellos, the Guardian’s resident puzzlemaster, has got you and your family covered for the festive season!

His new book, Think Twice, contains 70 seemingly simple puzzles that everyone gets wrong!

To be in with a chance of winning a copy of Think Twice, just answer the following question:

Please log in to your account or register to enter this competition!

ENTER NOW!

first.news/comps or see page 21. The closing date is 3 January 2025.