This is Quake running on CGA. Normally Quake requires VGA (320x200 256 colours), but WinQuake can actually run fine on any card supported by Windows 95.

Now, CGA doesn't support Windows 95. But turns out with a little manual hex editing, it can start with a CGA driver from Windows 3.0 (I believe no one succeeded in doing this before). And with Windows 95 kind of sort of running on CGA, @gloriouscow recommended to try if Quake would run. It does, and it is almost playable. Definitely more playable than Doom8088 on MDA.

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