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Re:Factorio: Space Age by pmoriarty on Friday August 25, 2023 @11:15AM (#37262656)
Factorio is closed-source, unfortunately. Still, you can read a lot about how the devs developed it on their "Friday Facts" posts: https://factorio.com/blog/
Re:Factorio: Space Age by bombcar on Friday August 25, 2023 @12:43PM (#37263851)
This is actually better than the raw source for understanding the development; you have to start at the beginning and read forward.

Basically - tests, reproducibility, and dedication to tracking down "weird minor bugs" before they become "major show stoppers".