I have such fond memories of the original Starcraft. When I was like 7 or 8, my parents got a computer for the first time (this was ~2004) and installed Starcraft on it. We still didn't have internet so all I got was the single player aspect but I loved it and must have dumped close to 100 hours playing it over the next 2 years or so.

After that I stopped playing Starcraft but when I was in high school I picked it up again and started playing online. The regular matches were cool but the coolest matches were "custom scenarios", my favorite being "mouse hunt". It was a scenario where one team had the weakest players and the other team had the strongest players but the weak team could create barriers that the strong team couldn't destroy. From there the small team would slowly build up and defeat the stronger team or the strong team would wipe everyone out before they could.

It's been years since I played the OG Starcraft but I think I'll be picking it up again soon. It's just such a damn good game and it's really stood the test of time where even if you pick it up today it doesn't feel like a dated game, Blizzard made a truly timeless game with Starcraft and that's not an easy thing to do.

Never played Starcraft II but from what I heard they mostly kept to the original formula and many folks love that game.