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I'm guessing this was written in an environment that doesn't support Android, hence the lack of Go and Quest versions...?

Also, is there no way to import files from my old CD-ROM copy of Wolfenstein 3D so that I can play the whole thing...?

I think since this conversion is made in Unreal Engine there's no simple way to add the rest of the episode officially, which is a shame.

Not at all. It's just a matter of parsing a file, and that's entirely doable in UE.

u can