Doomtcha

Kill Ops to prove you're a human.

Doomtcha is a "CAPTCHA" that requires users to prove they are human by slaying demons in the classic 1993 game DOOM.

Why?

We've all clicked on crosswalks and identified traffic lights. It's boring. I wanted a CAPTCHA that was actually fun. If you can strafe, aim, and shoot a pixelated demon, you're probably not a bot (or you're a very advanced AI agent, in which case, touché).

Tech Stack

• C++: The original DOOM source code.
• WebAssembly (WASM): Compiled using Emscripten to run in the browser.
• HTML5 Canvas: To render the game.

How It Works

The user is presented with a mini DOOM level. To "pass" the CAPTCHA, you must kill a specific number of enemies within a time limit.

Check out the source code on GitHub.