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 2 hours ago · not a live figure

—of peak

All-time peak

15 Sep 2026

Update cadence · public branch

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PICS live

2729 days

Since last public build

26 Mar 2019, 12:04 UTC

—

Median interval

Pattern appears after five builds

Builds in 30 days

0 with patch notes · 0 unannounced

—

Downloaded in 30 days

Quiet · no builds in 30 days

All 1 builds since 2019 · UTC

When Matt Sanderson ships

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036912151821

Mars Underground Patches · SteamPeaks

Mars Underground

Builds

All public

Major patches only

Date	Day	Time	Patch title	Build ID	Branch	Depots	Download Δ
26 Mar 2019	Tue	12:04	No patch notes · unannounced build	3680743	public	4	—

public branch · shipped todayother branchwide buildhas patch notes

Showing 1 of 1 builds · Δ is the compressed download for the public branch, available once the depot worker runsLoad older builds

Mars Underground

When Matt Sanderson ships

Mars Underground

When Matt Sanderson ships

Patch notes

Builds