Each week, straight after the show, we'll reveal a question here on the website. Once you've got the answer, save it.
Then, at the end of the current BBC ONE series (only), we'll reveal a number code which you'll have to crack using the answers to the weekly clues.
So make sure you hold on to each week's answers!
We won't accept any answers until the end of the series, so make sure you keep your weekly answers in a safe place until you get the code.