I've got the Mario Underworld, Overworld and Water themes down. I rock a mean Tetris theme, Katamari Damacy, Galaga. Just added the intro for Doom to my collection. Oh, and Zelda, can't forget the Zelda overworld theme.

Any suggestions?

dude, you need to record Galaga
I've never heard anyone play that on guitar, and seriously always wanted to.

do Road Blasters