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You should try for a full 3D implementation of Doom! I'm sure it's been ported to JavaScript at least a dozen times.

Wny stop there when you could just use a webassembly port of the actual game with hacked-in portal to the actual site somewhere... :P

For bonus points fire up a Windows VM that will run the original Doom files...

Or maybe a remote desktop into an OS with a sandboxed browser that runs a Windows VM that ...