https://doom-captcha.vercel.app/

built with v0 & vercel / how it works / @rauchg
x

How it works

A CAPTCHA that lets you play DOOM(r) to prove you're human (for
educational and entertainment purposes)

The project works by leveraging Emscripten to compile a minimal port
of Doom to WebAssembly and enable intercommunication between the
C-based game runloop (g_game.c) and the JavaScript-based CAPTCHA UI.

Some extensions were made to the game to introduce relevant events
needed for its usage in the context of a CAPTCHA.

  * Started out with a minimal, SDL-based port of Doom that can be
    efficiently compiled to WebAssembly
  * Tweaked the build to make it compatible with the shareware
    version of wad (doom1.wad) for legal use
  * Introduced new unofficial process flags:
      + -nomenu (m_menu.c) to skip the main menu and jump straight
        into the game
      + -autoreborn (p_mobj.c) to automatically rebirth the player
        after a 2s delay
  * Introduced callbacks into JS land to be used by the CAPTCHA UI:
      + onPlayerBorn when the player is born or reborn
      + onPlayerKilled when the player is killed
      + onEnemyKilled when the main player kills an enemy
  * Tweaked the default process flags in d_main.c to make the game
    more challenging:
      + -skill 5 sets the difficulty to "Nightmare!"
      + -fast makes it even harder
      + -warp e1m1 jumpstarts the game to where the action is
      + -nomenu doesn't let the player trigger the main menu

See the v0 UI generation or get the source.

Built on the shareware version of DOOM(r) released publically for
non-commercial use. DOOM(r) is a registered trademark of id Software
LLC, a ZeniMax Media company.

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Play DOOM(r) and kill

at least 3 monsters

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