The Ghost of RubangB on 30 December 2008
This is a really tough question, because I think so many games are really beautiful.
I'll have to go with Super Mario Bros. 3, Donkey Kong Country, Okami, Twilight Princess, Yoshi's Island, No More Heroes, and
Out of This World (aka Another World, aka Outer World)
All the Metal Slug games are all gorgeous. My favorite is 3:
