41 Hours: Prologue

A sci-fi first-person shooter with devices that manipulate time

Texelworks · Published by ValkyrieInitiative · Released Mar 19, 2021

Reviews: Mixed; 60% of 89
Recent reviews: Not enough recent
Players: 0; daily peak, Oct 28, 2026
Steam Deck: Playable
Last update on Steam: 5 years ago; Jun 3, 2021
Minimum PC: Minimum 2 GB of memory; 41 GB disk; Full requirements

What is 41 Hours: Prologue?

This free, single-player first-person shooter prologue follows Ethan, a scientist searching parallel universes for his missing wife. You fight robots and alien-controlled zombies, solve puzzles, and use portals, telekinesis, and invisibility to navigate extraterrestrial environments.

For you if...

+you like customizing guns with scopes and suppressors

Not for you if...

−you prefer shooters without puzzles or object manipulation

What players say

60% of 89 reviews are positive

Players praise the graphics and responsive movement, but criticize enemies spawning around them, clunky interactions, and poor optimization. A recent review also reports buggy menus and cursor problems on a dual-monitor setup.

Screenshots and trailer

41 Hours: Prologue system requirements

Minimum: Minimum 2 GB of memory, 41 GB of disk space.

As published by the developer.

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Minimum

OS: Windows 7
Processor: i5 or higher
Graphics: Minimum 2 GB of video memory
Storage: 41 GB available space

Does 41 Hours: Prologue have co-op or multiplayer?

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

Single-player

Does 41 Hours: Prologue 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
Some in-game text is small and may be hard to read
Default graphics settings perform well on Steam Deck

PC version details

DRM: None declared on Steam
Controller: Keyboard and mouse
Platforms: Windows
Achievements: 1
Steam features: Family Sharing
Languages: Full audio: English. Text only: Russian, Simplified Chinese.

Does 41 Hours: Prologue 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 27, 2026. How to filter AI games on Steam