All that glitters is not gold — but every cipher can be cracked.
Mega Joker turns cryptanalysis into a game. Climb your Codebreaker rank, decode live ciphertexts, and master every cipher family from Caesar to Vigenère.
Three rooms. One decrypting mind.
Every screen is built around real cryptanalysis — no fluff, no fake progress bars. Just ciphers, cribs, and the satisfaction of the plaintext falling into place.
Earn your Codebreaker rank
Start at Novice with a rank of 0 and build mastery across the cipher families, one session at a time.
- Track mastery per cipher family
- Progress from Novice to seasoned Codebreaker
- Bite-sized sessions you can finish anywhere
Read the ciphertext, pick the plaintext
Face a difficulty-scaled Caesar puzzle: one line of ciphertext, four candidate decodings, and the tools to reason it out.
- Ten-question runs that ramp in difficulty
- Show frequency and Reveal assists on tap
- Multiple-choice answers keep momentum high
Bring your own case
Paste any ciphertext, attach a reference photo, drop in a crib word, and let auto-detect guess the cipher — or force it yourself.
- Paste or type any ciphertext to crack
- Auto-detect, or lock to Caesar, Atbash, Affine…
- Optional crib to seed the attack
Every cipher, unlocked and hands-on
Encode, decode and explore each cipher family — organised by tier from Apprentice to Adept, each with a plain-language explainer.
- Caesar — shift every letter by a fixed amount
- Atbash — reverse the alphabet: A→Z, B→Y…
- Affine — E(x) = (a·x + b) mod 26
- Keyword & Vigenère for the Adept tier
See it in action
Crack your first cipher with Mega Joker
Download it, start a session, and watch the plaintext fall into place. Your Codebreaker rank is waiting at zero.