The title is misleading. This is in ChatGPT but not on ChatGPT. It's not running on AI. It's running on a site that serves an AI chatbot.

Still very cool though.

I suppose most people don't know this, but you can render web resources into chat harnesses via MCP apps [1]. The actual DOOM part of this runs on [2].

[1] https://modelcontextprotocol.io/extensions/apps/overview [2] https://github.com/cloudflare/doom-wasm

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dang 9 hours ago | parent [-]

Ok, we've switched the title above to a hopefully-clearer phrase from the article's first sentence.

	▲	chrisnager 9 hours ago \| parent [-]
		Works for me! Thanks for updating. Title changed from “DOOM runs in ChatGPT and Claude” to “A playable DOOM MCP app”.