Cipher Command vs CipherStreet

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.

CipherStreet is a story-driven puzzle game where every level is a real cryptographic cipher - from Caesar shifts to RSA public keys - wrapped in a cold-war spy thriller. Intercept encoded messages. Decode them with on-screen tools you discover, not tutorials you sit through. Unlock fragments of a decades-spanning conspiracy with every cipher you crack. By the end of ten chapters you'll have genuinely internalised the foundations of modern cryptography - roughly the first four weeks of a university course — without a single lecture. THE STORY A defector known only as The Architect has built a private intelligence network hidden inside ever more sophisticated ciphers. Your handler, Agent Kovács, sends each intercept with minimal context and maximum urgency. A mole. A missing codebook. A name that keeps reappearing across fifty years. Crack the codes before dawn. TEN CHAPTERS, TEN REAL CIPHERS • Caesar cipher: frequency analysis • Vigenère: the pattern inside the pattern • Rail Fence: transposition • Enigma (simplified): the crib attack that broke a war • Playfair: grid geometry • One-Time Pad: the perfect, unbreakable lock • Diffie-Hellman: sharing a secret in public • RSA: math as a lock • Hash functions: integrity, not secrecy • Steganography: messages hidden in plain sight WHAT MAKES IT DIFFERENT • Learn by doing: tools are discovered through play, never explained at you • Real, historically accurate cryptography, all running offline on your device • A genuine spy narrative with characters, twists, and a finale that recasts everything • No punishing fail states: get a cipher wrong and the story simply waits • Build and share your own encrypted intercepts; challenge friends to crack them FREE TO START Chapters 1–2 are completely free, no account required. A single one-time purchase unlocks chapters 3–10 and every cipher type in the Builder. No ads. No subscriptions. No tracking. The cipher is never the weakest link. The human always is.