Nobody said anything yet about Dune 2 or Monkey Island? Hmm... I was playing Dune 2 until the next morning, wondering how I would resist during the next (boring) school hours... It started the real-time strategy genre, for sure...
And Monkey Island? I started to learn english with with it, playing a little, pausing, checking the dictionary... Ok, it didn't start anything originally, but during the time it was played, it was the greatest adventure game, something everything else was compared to...
Maybe I'm subjective, in fact, for sure I am, but for me, these games are important landmarks...
Now I'm so nostalgic, I'm pressing the submit button and getting the emulator back ASAP...
See you next morning :-)