My parents never bought me the full game so I probably played those demo levels 100s of times. Thanks for the memory trigger haha.

Yeah! My intro to the series was the 3-level WC1 demo. I was absolutely blown away as I had never played any game like that before it. Instantly obsessed haha

Was the demo version a separate story campaign like the Starcraft one was?

MobyGames [1] claim they are unique missions. More or less the same story, but different maps, objectives and briefing text.

Maybe I need to re-download it, and check out the differences. I remember playing those six missions so many times before eventually saving up enough pocket money to buy the game, but I don't exactly remember them being different.

And it's actually six maps, three for each faction.

[1] https://www.mobygames.com/game/57961/warcraft-ii-tides-of-da...