Take on Operation Bletchley. Your codebreaking challenge 

Taking place twice a year, in July and January, your mission is to cover the miles, crack the codes and uncover the secret message you need to deliver to Winston Churchill before time runs out. 

From 1st July, take on one, two or all three of our missions:

Test your codebreaking skills as you conquer one of our epic challenges. Immerse yourself in the incredible stories of some of the bravest people who helped us triumph against our foes. Can you crack the final code before time runs out?

You can take part from anywhere in the world using your phone, fitness tracker or a good old map. 

Choose from one of three difficulty levels levels - junior, codebreaker or cypher expert. Be a part of something incredible this summer whilst supporting soldiers, veterans and their families. 

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

REGISTER NOW, your mission starts on the 1st of July.

Choose from one of our missions below!


It's July 1942 and the outcome of the war is balanced on a knife edge. We need you to cover 30 miles on foot, travelling across Cairo in it's blistering heat. Your mission is to track down an enemy agent and identify who has been leaking British Intelligence before the Nazis figure out Enigma has cracked their coded messages and change their codes. Can you handle the heat?


It's 1941 and the United Kingdom is in terrible danger. 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 to Winston Churchill before it’s too late?


It's 1942 and the situation in France is at boiling point. The Nazi occupation has cut us off from our agents on the ground, so we need you to go behind enemy lines to make contact. We cannot afford for our intel to be compromised, so you must move through the shadows and crack codes along the way to avoid detection. This mission is not for the faint hearted. Do you have what it takes?

Sponsor a friend

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