In an earlyer version there were passwords at the end of each mission. You had to type them in the launcher for activating the next mission. I think that was because the team didn't know at that time how to make a campaign where one mission came after another without causing bugs. (But maybe it was because of something different.) But now, in version 3.8.1, there are no passwords more, the campaign works just like the one from the original game.
The_Dark_King
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