Actually, I was playing this game like three days ago. It lags baddly on my Laptop. Although, my Laptop does happen to have a lot of Viruses... I have all the Levels I've made on Notepad.
Plus, I was thinking about making my own Super Mario 63 Level Mod, But that sounds a bit Ridiculous, Correct?
I'd give Super Mario 63 a 9/10. Exelent Game, But has its glitches (Mainly the Lag).