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I already asked this question above, but here's the problem: in a battle, I can't select a hero. I have a hero from a human castle, and that's it, but I can choose my opponents. There wasn't this problem in the demo version; maybe I'm doing something wrong, but I haven't figured it out yet.
Regarding the game itself, it's quite good. The flickering cursor is annoying, but I think the developers will fix these issues with patches. The turns are fast (in the 5th game, they seemed incredibly slow, but I also had a weaker computer back then), and the difference between higher and lower-tier units isn't as significant. In the 3rd game, I wouldn't have risked attacking angels in the second week, but here, it's quite manageable. Also, the hero upgrade system is interesting; you can customize them to your liking, choosing which spells to have and which not to, and so on. Overall, so far, so good.