Reply To: The official Challenge 10 tips and hints thread

[Harry]

A note on feedback

We have switched off the automatic feedback mechanism for Challenge 10 so that you can try to solve it without our immediate help. We will switch it back on at some point, so if you are really stuck don’t give up hope! Even without it, we think that the programme of hints and tips we are providing here should allow everyone to break the cipher before the end of the competition.