Obitus was the first real ....game i played on a computer....well the magic candle if you count ancient games on dos....but it was a hard game and you start off knowing nothing....
http://en.wikipedia.org/wiki/Obitus
the only reason i even bought a computer was to play myst...
then there was shooters ...doom and then half life....which i still play ...the new release of black mesa is epic....
then there is dungeon master 2 ...didn't like the first one as much...a game that turns games on their head ...your the bad guy killing and torturing the heros....
the game of games is system shock 2.....a game i can't stop playing....i'm play it now........
unreal ...if you haven't played it your missing out ...a long and complex game ...so beautiful that when it came out people were blown away with the graphics...
the rebirth of the rpg started with might and magic 6 a game that still intrigues me and keeps me playing...
daggerfall the game before morrowind in the elder schools series ...it was before auto map....and the game world was so huge that players got hopelessly lost and had to start over...
kings quest....i believe 6 or so ...that was a great one too....