How many people are playing Mars Underground right now?

Mars Underground is app 578420 on Steam. Player counts appear once the tracker has sampled it.

What is the all-time peak player count of Mars Underground?

0 concurrent players on 15 Sep 2026.

Mars Underground was released on Steam on 14 Mar 2019.

Every depot recorded for this app, sized by its current public manifest.

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Depot ID	Name	Platform	Language	Size on disk	Download size	Current manifest	Status
578421	—	Windows	english	301 MB	160 MB