Cipher Command

You are an intelligence agent stationed at a secret facility. Intercepted enemy transmissions are flooding in — and only you can crack them.

Black Signal is a historical cryptography puzzle game that puts you inside the world of WWII code-breaking. Decrypt authentic ciphers used in real military operations, uncover classified intelligence, and learn
the craft that changed the course of history.

CLASSIFIED MISSIONS
Work through 30 missions across three clearance levels — CONFIDENTIAL, SECRET, and TOP SECRET. Each opens with a full intelligence briefing, and each solved cipher reveals what actually happened in history.

7 AUTHENTIC CIPHER SYSTEMS
Every cipher was used in real military operations — from the ancient Caesar shift to the legendary Enigma machine. Break them all using interactive, historically accurate decryption tools.

- Caesar Cipher
- Substitution Cipher
- Rail Fence Cipher
- Vigenere Cipher
- Playfair Cipher
- ADFGVX Cipher
- Enigma-Inspired Cipher

FEATURES
- Hands-on cipher tools for every encryption type
- Guided tutorials that teach real cryptanalysis
- Progressive difficulty from CONFIDENTIAL to TOP SECRET
- Historical context for every mission and cipher
- 15 achievements from Field Agent to Master Cryptanalyst
- 4 bonus mission packs: Pacific Theater, D-Day, Eastern Front, Cold War
- No ads. No data collection.

From Lepercon Studios — Decrypt History. Show More