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

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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 3 hours ago · not a live figure

—of peak

All-time peak

15 Sep 2026

Steam user reviews · 56 written

Updated 12 Sep 2026, 18:35 UTC

SteamPeaks Rating

81.1

Positive

Positive share

96.4%Very Positive

Last 30 days

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No reviews in the last 30 days

Played before writing

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Sampling starts with the review poller

Reviews per day

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From Valve’s daily histogram

How sentiment moved · share of new reviews that were positive

Awaiting the histogram

Not enough samples yet. The line appears once a few readings are in.

Positive shareReviews writtenLifetime shareDrag across the chart to zoom · double-click to reset

Mars Underground Reviews · SteamPeaks

Mars Underground

Mars Underground

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Review history