THE ULTIMATE CODEBREAKING CHALLENGE
50* Miles | 10 Codes | 1 Month | July 2025

Have you got what it takes?

Your mission: July 2025, walk 50* miles, crack 10 fiendish codes, and deliver a secret message before time runs out!

From July 1st, embark on a thrilling adventure set in 1941 securing a new line of communication from Bletchley Park to The Cabinet War Rooms in London. You must deliver an encrypted message to Sir Winston Churchill on time - have you got what it takes to go undercover and complete your mission?

  • Take part from anywhere using your phone or fitness tracker.
  • Challenge yourself, your family, and friends to walk or run the 50 miles or more.
  • Crack the mind boggling puzzles and codes along the way.
  • Explore the outdoors while learning about the incredible heroes of the Second World War.

Join one of the UK's most innovative events and prove your codebreaking skills!

REGISTER NOW - Your mission starts on the 1st July.

*option to adjust your miles to suit your ability.

CODES

Choose from three code levels:

  • Junior
  • Codebreaker
  • Cypher Expert.

Join this exciting challenge this summer and support soldiers, veterans, and their families.

You have one month to walk the miles, crack the codes, and deliver the final secret message.

REGISTER NOW - Your mission starts on the 1st July.

LONDON

It's 1941 and the United Kingdom is in terrible danger. Luftwaffe bombs are raining down on towns and cities across the nation. The Royal Air Force guards the skies and the Navy protects the seas, but the threat of invasion has never been higher. German spies could destroy our telephone network at any moment, so the Home Guard is tightening up security around the capital. 

Your mission is to help us secure a new line of communication from Bletchley Park to the Cabinet War Rooms in London. We need you to walk the 50-mile route, making contact with key agents to solve puzzles along the way. Can you figure out the code and deliver the message before it’s too late? 

Sponsor a friend

Find the fundraising page of someone already taking part in Operation Bletchley