slavi-t
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I haven't finished the last campaign yet, but so far, I've only encountered significant difficulties in two campaigns: the first one and the one where Kolyan is resurrected. He gave me a hard time; I had to replay it three times because of glitches. The most interesting part happens when he locks himself in the castle, and every day, he gains a thousand dragons. It's so intense that you might as well restart the game immediately.