a) Up the resolution and there you go. Enjoy.
Ex: RE4 on PS3.
b) Up the resolution, improve textures, models, lighting, effects.
Ex: FFX HD.
c) Rebuild everything from the ground up.
Ex: Oddworld New n' Tasty.
No troll is too much for me to handle. I rehabilitate trolls, I train people. I am the Troll Whisperer.