Enigma Machine Simulator

About Enigma Machine Simulator

Enigma Machine Simulator is a browser game from DEXM Labs, made by Arthur Jones and launched in October 2026. At its heart is a working Enigma I as the German Army and Air Force used it: rotors I to V with their real wiring and turnover notches, reflector B, ring settings, a ten cable plugboard and the double step of the middle rotor. You can use it as a plain simulator, typing or pasting letters and watching them come out enciphered.

The daily game turns that machine into a puzzle. Every day there is a new numbered intercept and a key sheet listing the three rotors and their order, the ring settings, the start positions and the plugboard pairs, except that one cable has been smudged. You set the machine from the sheet, guess which pair of letters the missing cable joins, and run the intercept through. A wrong cable gives garbled text; the right one gives the message. You have six tries, and your played, won, streak and best counts are kept on the page.

It differs from daily cryptograms because you never solve a letter swap by pattern. The work is in setting the machine correctly and narrowing down which letters the missing cable could join, so it suits players who like ciphers and the history of codebreaking. The page also explains how the machine works, why no letter can encipher as itself, and how the Polish Cipher Bureau and Bletchley Park broke it. A practice intercept gives more rounds once the day's is done.

How to play Enigma Machine Simulator

1. Open the page and press Today's intercept to see the day's key sheet and ciphertext.
2. Set the left, middle and right rotors, their rings and their start letters as the key sheet lists them.
3. Enter the plugboard pairs from the sheet, then choose a pair for the smudged cable.
4. Run the intercept through the machine and read the result: a clean message means you found the cable.
5. If the reading is garbled, change the missing pair and try again; you have six tries in all.
6. Copy your result to share it, or press Practice intercept for another round.

Screenshots

Tips

• Letters already used by the other cables on the sheet cannot be on the missing one, which leaves far fewer pairs to try.
• The machine starts again from your settings each time, so check the start letters before every reading.
• Look for a readable word in a part of the reading; it shows the settings are right even where the missing cable garbles a few letters.
• Use the practice intercept to get used to setting the rotors before you spend the day's tries.

Questions