Mars Underground

A time-loop adventure where each day ends with the apocalypse

Matt Sanderson · Released Mar 14, 2019

Reviews: Very Positive; 98% of 60
Recent reviews: Not enough recent
Players: 0; daily peak, Oct 29, 2026
Steam Deck: Playable
Last update on Steam: 7 years ago; Mar 26, 2019
Minimum PC: DirectX 9 GPU; 4 GB RAM · 0.3 GB disk; Full requirements

What is Mars Underground?

In this free-to-play 2D adventure, a student's first day at a new school keeps repeating. You explore Phobos City, talk to residents and collect items across cycles, unlocking conversation topics and working toward different endings.

For you if...

+you enjoy strange humor and eccentric characters
+you like piecing together nonlinear stories from clues

Not for you if...

−you want progress without replaying familiar actions

What players say

98% of 60 reviews are positive

Players praise the puzzles, writing and music. One reviewer criticizes the lack of a satisfying overall conclusion.

Screenshots and trailer

Mars Underground system requirements

Minimum: DirectX 9 GPU, 4 GB RAM, 0.3 GB of disk space.

As published by the developer.

Can my PC run Mars Underground?

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Minimum

OS: Microsoft® Windows® 7/8/8.1/10 (32bit/64bit)
Processor: Intel Core2 Duo or better.
Graphics: DirectX 9/OpenGL 4.1 capable GPU.
Memory: 4 GB RAM
Storage: 300 MB available space
DirectX: Version 9.0

Does Mars Underground have co-op or multiplayer?

No: single-player only, no multiplayer modes declared. With Remote Play Together, one copy is enough to play the local modes online with friends.

Does Mars Underground run on Steam Deck?

Playable Playable: it runs on Steam Deck with some adjustments.

Default controller config not fully functional
Sometimes shows mouse, keyboard or non-Deck controller icons
In-game text is legible on Steam Deck
Default graphics settings perform well on Steam Deck

PC version details

DRM: None declared on Steam
Controller: Full controller support
Platforms: Windows, Linux
Achievements: 22
Steam features: Cloud saves, Family Sharing
Languages: Text only: English.

Does Mars Underground use AI-generated content?

No AI-generated content is disclosed on the game's Steam page.

Self-reported by the developer under Steam rules: it covers AI content that ships in the game, not tools used to make it. Steam page checked on Oct 28, 2026. How to filter AI games on Steam