Hmm... I'm not sure if I could choose any ONE game as my favorite since they all are so different and special in their own way. I like how one poster put the top games of theirs for a console...
But, if I had to choose 'one' game that really stands out, it'd be Command and Conquer - specifically Red Alert. Man, I loved those games. Only limited by how much money you had. Massive tank rushes against your opponent
But, there are so many great games from the past - Battletoads, Mega Man X, A Link to the Past, XCOM UFO Defense, Doom, Goldeneye, and more.
We've been lucky to play some pretty fantastic games.