[ReneFroger]

I'm wondering if running Doom in PDF files might be achievable, or is that a step too far away?

[vanderZwan]

Probably in the domain of technically possible but good luck trying to get it to run fast enough and with little enough memory that the PDF engine doesn't crash.

[vk6]

It's definitely achievable, and it even runs with a playable framerate: https://news.ycombinator.com/item?id=42678754