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I don't know, but it seems to me that GSC is a very good option when you've played all the scenarios and everything gets boring. Besides, I don't like the somewhat deterministic nature of the scenarios – everything is crammed into too narrow a framework. But in GSC maps, you can develop your hero however you want. The only downside for me personally is Hammers of Fate 2.0, so my GSC is somewhat limited: for example, I can't choose a faction. But that's just my personal tragedy that I still haven't installed the patch.