Caesar's Wheel
Send orders three letters down the alphabet, then turn through every shift until a runner's message gives itself away.
Five chapters, one desk
Use it. Then break it.
Mary's Letter
Copy out a letter bound for a brewer's barrel, then count symbols and watch E, T and A fall into place.
Vigenère's Square
Write with the cipher called indecipherable, then measure repeated gaps as Babbage did to find the key.
The Enigma
Set the day's rotors, wire the plugboard cable by cable and watch the lamps glow with every click.
The Bombe
Drag the crib along a weather report, find where no letter faces itself and set the drums turning.
Seals & Rank
Wax seals mark your timeline and every broken intercept joins your record, from Recruit to Bletchley Fellow.
The Tools Stay Yours
Seal notes with Caesar, a keyword alphabet, Vigenère or your own Enigma key, and print a paper wheel to cut out and pin.
About Us
Who keeps the lamp lit
🕯️ We are a small team of puzzle lovers, history readers and museum wanderers who never quite got over the first time we stood in front of an Enigma. Midnight Cipher Room is our desk, and we built it for you to sit at.
🏛️ Our mission is simple: teach the history of secret writing by putting it in your hands. You do not just read about the great ciphers. You use them, and then you break them the way they were really broken.
🔐 You get paper wheels, symbol counts, Vigenère squares, rotors, plugboards and a Bombe, plus a timeline of wax seals and a service record from Recruit to Bletchley Fellow. When the history is done, the tools stay yours for sealing notes to friends.
🗝️ Every great secret was once an idea only two people could read.
Privacy Policy
Your secrets stay yours
Effective Date: September 2026
Midnight Cipher Room does not collect, store or share any data. Everything works locally on your device.
1. Information We Collect
None. We do not collect personal information, messages, keys or usage data of any kind.
2. How We Use Information
Because we collect nothing, we use nothing. Your messages, keys and progress are used only by the app on your device to run the ciphers and show your timeline and service record.
3. Data Storage
Everything, including your progress and any notes you seal or decode, stays on your device. There is no cloud storage and no server holding your information.
4. Third-Party Services
The app contains no analytics, no advertising and no trackers, and it does not pass anything to third parties.
5. Data Security
Since nothing leaves your device, nothing can be intercepted from us. The security of locally stored content depends on your device's own protections. Notes you seal for friends are shared only by the means you choose.
6. Children's Privacy
The app collects no personal information from anyone, including children under 13, which keeps it in line with the spirit of COPPA. Young codebreakers are welcome.
7. Your Control
There are no accounts to create or manage. To delete everything the app holds, simply uninstall it.
8. Changes to This Policy
If this policy changes, we will update the date above. Our commitment to collecting no data will not change quietly.
9. Contact
Questions? Write to privacy@midnightcipherroomapp.com.
Contact Us
Send us a dispatch
✉️ Got a question, a bug, or a cipher you want to see next? Write to us, we love hearing from fellow codebreakers.
General inquirieshello@midnightcipherroomapp.com
Technical supporthelpdesk@midnightcipherroomapp.com
Business & partnershipspartners@midnightcipherroomapp.com
⏳ We reply within 24 to 48 hours, usually before the tea goes cold.