Wow, a decent amount when i look at them..
a majority of my games are on steam, so i can't, but i'd say def. a majority of the total war games (Medieval 2 maybe not, but def. rome total war, empire, napoleon,and shogun 2)...
after that, probably a majority of my GBA games that i had when my old DS worked...even with no cases, no manual, nothing to play them on at the moment, i cherish my old harvest moon and Advance Wars 2 games, so many hours of playing. Beyond that..hmmm. Monster hunter Freedom Unite on my PSP that I haven't played in awhile...But a majority of my PC games, for sure.