It doesn’t seem possible that this is the 25th National Cipher Challenge, but it is, and we couldn’t be more excited to share it with you. Whether you are an old hand at this or are joining us for the first time you are very welcome and we hope you enjoy it. This year we will be exploring the curious adventure of Sarah and her friends and colleagues as they try to solve the mystery of the missing silver. You will need patience and cunning to help her unwrap the layers and solve the riddles pointing to the solution, but we think you will have fun doing that, and you might even learn something along the way. We have £6,000 in prizes to award to our best codebreakers this year, and everyone who takes part will be able to download certificates to record their achievements. We will also award a number of medals, and medallists and prize-winners will be invited to join us for the Prizegiving at Bletchley Park on March 10th. We really look forward to meeting you there. You can follow your progress on the leaderboards, and this year, as part of our celebrations, allowing you to compete against other teams in your school, your region and the whole country. We are also introducing an Alumni & Teachers leaderboard for those who want to take part but do not qualify for prizes. If you have any questions please head over to the Forum to post them there, or send us an email at [email protected] and we will try to get back to you. You might have to be patient because there are not many of us here at BOSS HQ and there are a LOT of you out there, but we try to reply to every message within a couple of days. Harry, Jodie and the Elves