Solve it. Understand ciphers.
A puzzle game where you UNDERSTAND ciphers by solving them - not by reading about them. From the Caesar cipher to RSA and hashing, crack classic and modern ciphers one stage at a time and the way each one works clicks into place.
Shift, swap, reorder - the origins of cryptography
Shift letters by N. Work out the shift from the crib and enter it (10 puzzles).
Polyalphabetic with a keyword. Guess the key to decrypt (10 puzzles).
One-to-one swap. Crack it with frequency analysis (8 puzzles).
See through the reordering of letters (6 puzzles).
Letters to numbers via a 5x5 grid; reverse-look up (6 puzzles).
XOR is free. Public-key, hash & block via the Modern Cipher Pack
Exclusive OR. XOR with the key to recover the text (6 puzzles, free).
Lock with the public key; find the hidden message.
Feel one-wayness; find an input that collides to the same output.
Step through add-key, substitute, and permute rounds.
Every choice serves the solving experience
History, real-world usage, weaknesses, and the bridge to modern tech - while the win is still fresh.
A free recap first, then gradual reveals when stuck. Never spoils it all at once.
No ads are ever shown while you are working on a puzzle. Focus is preserved.
Earn a badge for clearing each category, with stats to keep you going.
The same experience on iOS and Android. Ciphertext shown in a clean monospaced font.
All classic ciphers and the modern intro are free. Hints and packs are optional purchases.
The third information-systems title of the Raku Series. Knowledge from ARURAKU (algorithms) and DATARAKU (data structures) pays off in NazoRaku's decryption - hashing and modular exponentiation tie ciphers back to the fundamentals.
Anyone who loves puzzles and riddles / Students and engineers curious about cryptography and security / People who want quick brain-training in spare moments