Break Codes Like Alan Turing.
Decipher real coded letters and telegrams from world history. Learn new codes and explore secrets of the past monthly.
Get six months of secret codes in the mail for just $49.99.
— Andrew W.
★★★★★“Gave Letterjoy to my Dad for Father’s Day. He loves the letters. Best gift I ever gave him!” — Lisa L.
★★★★★“My husband said this is the best Father’s Day gift he has ever gotten. He loves the letters!” — Susan L.
★★★★★“Got our first one yesterday! My 12 year old history obsessed son loved it.” — Jen M.
★★★★★“My father really enjoys his letters. Received his first one after Father's Day and looks forward each week to the next one.” — Robert K.
★★★★★“Got my dad Letterjoy for his birthday, and the first one arrived today. Heard from him right away - he loved it!”
"Like Sudoku For Spies"
Think you'd make a good spy? Join the Codebreaking Club and put your cryptanalyst skills to the test with one real secret message from the past each month.
Never solved a cipher before? With the Codebreaking Club, learning to solve ciphers is easy.
Every Codebreaking Club envelope includes step-by-step instructions for deciphering your latest message. You'll be cracking codes in no time!
Each Codebreaking Club envelope includes:
- A Secret Code: A replica of a real coded letter or telegram from the past for you to try your hand at deciphering, mailed on beautiful stationery or parchment.
- Decoding Instructions: A short guide to help you decipher your latest message.
- The Story of Your Message: Below your instructions is a short article telling the story of your latest message and the figures from history who wrote and deciphered it.
- A Decoded Transcript: Flip your instruction sheet upside down to see a transcript of your latest message, fully deciphered, and see how you fared.
- First-Class Postage: All Codebreaking Club secret codes are delivered via USPS First-Class mail.
Shipping Timeline: Members who join today will receive their first Codebreaking Club Code in October.
Codebreaking club coded messages are mailed out at the start of each calendar month.
An Intriguing Gift That Keeps On Giving
Delight the puzzle lovers, math nerd, or history buff in your life with a gift that will deliver hours of joy every month.
With a flexible membership length, membership to the Codebreaking Club is a great gift for any occasion.
Need a small thank-you gift or a get-well-soon surprise? Send two or three months of coded messages.
Want a grand birthday or Christmas surprise? Give your codebreaker the full-year package for a gift that keeps on giving. With our easy subscription management, you can pause or cancel your membership at any time.
A Unique Screen-Free Supplement To Your STEM & History Curriculum
Liven up your lesson plans with secret codes. Each edition of the Codebreaking Club is a self-contained, screen-free, hands-on activity. Students can work independently or collaborate in groups.
Through the Codebreaking Club, your students will engage deeply with historical figures, concepts, and events from their textbooks and receive an introduction to the world of cryptanalysis, ciphers, and signals intelligence.
Codebreaking Club memberships are available in bulk for schools, clubs, and learning pods.
Our secret codes are also available in a growing list of state ESA marketplaces to serve homeschool and unschooling families.
A Window Into the History of Spycraft and Intelligence
Throughout history, spies and counterintelligence professionals have waged a clandestine war over information. These battles are fascinating and historically significant, but because of the nature of the work, they're also extraordinarily hard to follow.
Our goal with the Codebreaking Club is to make the methods these spies, soldiers, and diplomats employed to smuggle information across enemy lines, the methods used to break their codes, and the classified intelligence they were smuggling, accessible.
If you like reading about topics like the Culper Spy Ring, "Room 40," Bletchley Park, OSS, CIA, DIA, and NSA, you'll love this series.
Please Note: Unlike most Letterjoy products, which are weekly, The Codebreaking Club publishes one coded message a month.
As Seen In
Member Testimonials
★★★★★
“I ordered two sets - one for me and one for my grandkids who live in another state. We truly enjoy working together on Facetime to break the codes together!”
— Susan S.
★★★★★
“These are being given as a gift, and the recipient is very happy and enjoying them thoroughly! His career was in cyber-security, so he particularly likes cyphers.”
— Elizabeth F.
★★★★★
“I've only received one letter so far, but I thoroughly enjoyed the process of feeling what it must have been like for the original codebreakers.”
— James D.
