The foremost game in my memory I done this to was Halo 3, me Psy and Dan had just completed it on legendary and I just suddenly kicked off in solo mode on it whooping ass.

I've done it with FF8, FF9 and several others, I loved FFX's blitzball so much I went back after completing the game to a save in killika so I could try to beat the goers in the first game it's difficult I'll give it that. Also FFTA