If a friend already owns Factorio, they can use Steam Family Sharing to let you play their library for free while they are offline.
We have to address it. Some users will suggest cracked versions of Factorio (illegal copies from torrent sites). While these exist, you lose: factorio free steam key
If you decide to buy, get it directly from (gives a Steam key + DRM-free copy) or Steam . If a friend already owns Factorio, they can