CAPTCHAs built to be talked about
One-off builds by developers and designers: a CAPTCHA that makes you play DOOM, one that makes you sight-read piano. We describe them, show our own screenshots and link to the originals. These are experiments, not installable CAPTCHA services.
On display
Two to start, more as we capture them. Explore each exhibit or visit the original.
DOOM CAPTCHA
Asks: defeat three monsters in a WebAssembly build of DOOM. Why it matters: it makes the cost of a challenge impossible to ignore.
Worst. CAPTCHAs. Ever.
Asks: play piano, hunt ducks, scratch a ticket or win at blackjack. Why it matters: four deliberately frustrating ways to interrupt a login.
More one-offs
Custom challenges, slider puzzles and meme CAPTCHAs.
Each exhibit goes up after we have captured our own screenshot and confirmed the author. Seen one worth showing? Tell us.
2 exhibits
Fun to look at. Expensive to use.
Every challenge stands between a visitor and your form. Protect your forms without a puzzle. Try CleanTalk free for 7 days, no card.
Our screenshots were captured on 12 November 2026. We do not host or embed the authors' code. Sources: DOOM CAPTCHA by Guillermo Rauch and Worst. CAPTCHAs. Ever. by Michael Hsu.
