Another World was the first game, Flashback the second.
AW ruled, FB absolutely crushed everything, and still does IMO.
Loom, now thats one seriously great MF'ing game.
Myst, oh baby, in its time, it was soo soo cool.
Elite II, still playing it on my Amiga, oh how I love it.
Chaos Engine, played it on my Amiga so damn much, senseless violence, but damn it was fun.
And then this one game, I cant even remember its name anymore, a copter sim for the Mac, where you flew around in a big city consisting of white skyscrapers, and the mission was to blow away a flying dowhacky, damn I loved that game so much
And of course, the mother of all blood and action, Doom I
A few more I thought of.
Freespace 2, the first was so fscking good, and the second even better.
WarCraft 2 multiplayer, oh thats almost better than sex