If you want to play Factorio on Linux without spending money in 2021, the demo is your best friend. Unlike many game demos that last 30 minutes, the Factorio demo offers several hours of gameplay.
Here is the irony: If you buy the game once from the Factorio website, you get a DRM-free copy. You can put that factorio folder on a USB stick and run it on any Linux machine you own. The developers trust you. Don’t betray that trust. factorio linux free download 2021