The “I’m Not a Robot” CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) is a security ...

There's a Doom-themed CAPTCHA that's making it way more entertaining (and challenging) to prove you're a human.

CAPTCHAs, which are used by websites to confirm whether users are people or bots, are harmless, but hackers are using them to infect PCs with malware.