Well as the proud owner of a working Atari 2600, which my housemates and I still use, I have to though in some games older than most of the posters here
.
River Raid (Atari)
Dig Dug (Atari)
Pitfall (Atari)
Ok we also have a PS2 so...
Gran Tourismo 3
Kingdom Hearts
MOH both of them for PS2