post-war breakout
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Starting from level 75, the game behaves unpredictably when leveling up further (due to large experience numbers), so excessive "leveling up" of heroes can lead to problems.
No, it's not about the experience, but something else. It's surprising.
And taking this opportunity, I'll say: I read your mapmaking course, and it's quite good – it's like opening a textbook again, such a methodical approach. You have to be a real superfan of the game to do something like that for free. Interesting.