The School of Mathematical Sciences at the University of Southampton warmly welcomes you to its 23rd national codebreaking competition.

With the final deadline bearing down upon us we have been publishing some hints about how to break Challenge 10 in our news pages, so with that in mind we have slightly edited the menus to add a News link at the top level. Sorry if this caused any confusion, but hope it is useful for some. We also hope you all had a fabulous Christmas and that those of you who saw snow at the weekend were able to enjoy it. Technically it arrived before twelfth night, so I think that counts as a rare White Christmas! The team here at Cipher Challenge Central have enjoyed watching how you all got on, and have written to some of you to ask for more information about how you cracked Challenge 10B. Thanks to those of you who got back to us. If you had a message asking for this it will have appeared in the top left corner of the webpages, but you will also find it in the Messages section of your account page. If you did get a message and didn’t get back to us yet, please do, we are really looking forward to hearing from you.

PS We hope you enjoyed Harry’s Christmas Miscellany. You will find the solution to the fabulous crossword, Heroes by Skylark, in the News recently.

Wishing you all a very happy and prosperous New Year,