Mortal Decay

First-person survival horror inside a prison after World War III

Roger Kaffer · Released Oct 28, 2020

Reviews: Very Positive; 96% of 55
Recent reviews: Not enough recent
Players: 0; daily peak, Oct 28, 2026
Steam Deck: Untested
Last update on Steam: 4 years ago; Mar 7, 2022
Minimum PC: GTX 760; 4 GB RAM · 4 GB disk; Full requirements

What is Mortal Decay?

This single-player, first-person survival horror game follows a starving survivor who enters a seemingly abandoned prison looking for food after World War III. You sneak past enemies, search the prison, and try to find a way out.

For you if...

+you want a horror game for a single sitting
+you enjoy uncovering backstories through scattered notes and letters

Not for you if...

−you want to fight enemies rather than avoid them

What players say

96% of 55 reviews are positive

Players praise the voice acting, story twists, and scares. Some find the game too easy.

Screenshots and trailer

Mortal Decay system requirements

Minimum: GTX 760, 4 GB RAM, 4 GB of disk space.

As published by the developer.

Can my PC run Mortal Decay?

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Minimum

OS: Windows 10
Processor: AMD FX-6100
Graphics: Nvidia GTX 760
Memory: 4 GB RAM
Storage: 4 GB available space

Does Mortal Decay have co-op or multiplayer?

No: single-player only, no multiplayer modes declared.

Single-player

Does Mortal Decay run on Steam Deck?

Untested Not yet tested by Valve on Steam Deck.

PC version details

DRM: None declared on Steam
Controller: Keyboard and mouse
Platforms: Windows
Achievements: 8
Steam features: Family Sharing
Languages: Full audio: English. Text only: Portuguese - Portugal.

Does Mortal Decay 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