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.

When was Mars Underground released on Steam?

Mars Underground was released on Steam on 14 Mar 2019.

Status

SteamPeaks

Mars Underground

GameApp ID 578,420by Matt SandersonReleased 14 Mar 2019

View on SteamSteamCompare

App ID578,420

Release date14 Mar 2019

Engine—

Install size1.10 GB

TypeGame

Last update26 Mar 2019

Steam Deck—

DLC1

DeveloperMatt Sanderson

Changenumber37,436,216

Price—

Packages0

PublisherMatt Sanderson

SystemsWindows · Linux

Followers—

Depots5

Compare this game

Mars Underground

Matt Sanderson
Released 14 Mar 2019·App 578420

Steam user reviews

Very Positive

96.4%· 56 reviews

Recent —

SteamPeaks Rating

81.1 Positive

Recent 30 days —

How it works

Last seen

Sampled 4 hours ago · not a live figure

—of peak

All-time peak

15 Sep 2026

Update history

A permanent record of every observed change.

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Mars Underground Update History · SteamPeaks

Showing keys matching the filter · 1 event on this page has no match

Time (UTC)SourceWhat changedAddedEditedRemovedReference

5 Sep 2026

07:02:13PICSPublic manifest changed+143——#37,436,216

Recorded change · 5 Sep 2026, 07:02:13 UTCView all 143

Status	Key	Previous value	New value
Added	Languagedepots.578423.config.language	—	english
Added	Architecturedepots.578423.config.osarch	—	64
Added	Operating systemsdepots.578423.config.oslist	—	macos
Added	Download size on publicdepots.578423.manifests.public.download	—	168.7 MB176857664
Added	Manifest on publicdepots.578423.manifests.public.gid	—	8435523894066683751
Added	Size on disk on publicdepots.578423.manifests.public.size	—	341.3 MB357911706