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I completed the first two campaigns on normal difficulty – it was incredibly boring. The third and fourth campaigns on hard difficulty were much more enjoyable. I got stuck on the last mission of the fourth campaign. I didn't feel like replaying it. So, I decided to start over on hard difficulty, but without saving. Yesterday, I completed the tutorial campaign with this approach. Well, what can I say... It was quite challenging! Today, I'll try out Necropolis.