Casefall: Whodunit Mysteries

Twelve cases. One accusation each. Everything you need is on the page.

Casefall is a detective game made of reading. Each case is a short, self-contained mystery — a saboteur inside a snowbound research station, a blackmailer working a restaurant kitchen, a hospital radio volunteer who vanishes between six o'clock and half past. You read the file, you weigh the suspects, and you name one. Then you find out.

FAIR PLAY, ALWAYS
Every case obeys one rule: the clue that convicts is in the text before the question. No culprit invented in the last paragraph, no witness who conveniently remembers something after you have guessed, no supernatural escape hatch. If you missed it, it was there, and you can go back and find it.

THE DEDUCTION
Getting the answer is the easy half. The reveal always tells you who did it and the single decisive fact — free, every time, whether you were right or wrong. Beyond that sits the full deduction: the complete walkthrough, clue by clue, showing what each detail eliminates and how the chain closes. It is the part that teaches you to read the next case better.

THE VAULT
Alongside the original cases, a library of classic detective fiction from the era that invented the form — public-domain works by Arthur Conan Doyle and G. K. Chesterton, complete and unabridged. Free, no unlock, no time limit.

BUILT FOR ACTUAL READING
- Works completely offline. Every case and classic is bundled in the app.
- No account, no sign-up, no email address.
- Dark and light themes, adjustable type size.
- Remembers where you stopped, and never loses your place.
- Your progress and your verdicts stay on your device.

WHAT IT IS NOT
No timers. No streak to break. No energy meter, no lives, no leaderboard nagging you back. A case takes five to eleven minutes, and then it is over.

HOW IT IS FREE
Casefall is free and supported by ads. A banner sits below the case list, and you can watch an optional short video to unlock a full deduction or one of the longer cases. Optional means optional: the case, your verdict, the culprit and the solution are always free, and anything you unlock stays unlocked on your device.

ABOUT THE WRITING
The original cases are written with AI assistance and reviewed before publication. The classics in the vault are genuine public-domain works, reproduced as published, with the author and year shown on every one.

Written for grown-up readers. Contains crime and its aftermath, described in the manner of classic detective fiction — nothing graphic.