Tekken Dark Resurrection

[LunaMoo]

Don't have the game but people before you mentioned 2 stages doesn't work at all with non-buffered rendering and you say they look blurry and weird so I would guess, those stages might be using some full screen effect with block transfer which means doesn't matter what resolution for rendering you set it will look like x1 res.

You could try disabling "simulate block transfer" in graphics settings which if my guess is right might get rid of just the effect restoring higher res, but depending how game works, it might also leave you with black screen, so good luck with that.