Doom CAPTCHA is a project created by software engineer Guillermo Rauch, which uses the first-person shooter game Doom to prove that a user is not a bot. Players must kill at least three enemies in nightmare mode to verify their humanity. The controls are simple, but it can be frustrating to defeat the demons, especially in nightmare mode. Doom's reputation for unconventional gameplay and its availability on various platforms have made it a popular choice for experimentation among developers. Rauch hinted at future updates to make the CAPTCHA even harder.



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