Cold Case Bureau vs CipherStreet

One case a day. The same case for everyone. Nothing to buy, no ads, no account. Cold Case Bureau puts a case file on your desk: the victim, the suspects, the evidence, and somewhere inside it, one story that doesn't hold together. Read the file. Find the two statements that can't both be true. Pin them on the board and watch the string pull tight. Then build your theory, not a guess from a menu, but an argument, element by element. Get part of it right and that part locks in. Get part of it wrong and the case tells you exactly which part, and lets you keep working. THE DAILY CASE Every day the Bureau opens one case, and it's the same case for every player in the world. Solve it, keep your streak alive, and share your result. A spoiler-free grid that shows how you did without giving anything away. SEASONS Six linked cases told in order, at your own pace. Season One, The Ninth Desk: every file holds an older case the Bureau closed too quickly, and the same violet stamp on each one. Close a case, and the Season File tells you what you've found. INVESTIGATE Four Case Hours, and a case that offers more than four hours of leads. Press a suspect with a piece of evidence and what they say depends on what you chose to show them. Pull records nobody asked for. Send evidence to the lab. Earn a warrant with proof from your board. A wasted half hour is on you, but the case can always be closed from the file alone. Nothing is ever locked behind a guess. THE INVESTIGATION BOARD Real red string. Connect two pieces of evidence that contradict each other and the connection is established permanently. The board is where you prove people are lying. THE ARCHIVE More than a hundred past Daily cases, free to work in any order, from quick Rookie files to five-suspect Senior investigations with paper trails that close like a net. FAIR PLAY, GUARANTEED Every case is verified solvable from its own evidence before it ships. Every question has exactly one answer the file supports. If you reason correctly, you win - that's the whole promise. No ads. No purchases. No timers that want your money. Just cases.

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.