Klaus Veen's Treason

A first-person social deduction shooter with detectives, doctors, and traitors

Tomorrow Software · Published by Klaus Veen · Released Jan 31, 2023

Action Casual Indie RPG Strategy Free To Play

Reviews: Very Positive; 89% of 1,703
Recent reviews: Not enough recent
Players: 1; daily peak, Oct 28, 2026
Steam Deck: Playable
Last update on Steam: 10 months ago; Dec 16, 2025
Minimum PC: 1 GB RAM · 4 GB disk; Full requirements

What is Klaus Veen's Treason?

This free-to-play, mafia-themed multiplayer shooter mixes first-person combat with social deduction. Each round revolves around the Don's murder: innocents collect and turn in clues to expose traitors, then try to eliminate them before the traitors kill all innocents.

For you if...

+you enjoy bluffing and figuring out whom to trust
+you like using role-specific gadgets alongside guns

Not for you if...

−you prefer solo play over competitive multiplayer
−you want straightforward firefights without clues or hidden roles

What players say

89% of 1,703 reviews are positive

Players praise the gun handling, map design, and continued updates.

Screenshots and trailer

Klaus Veen's Treason system requirements

Minimum: 1 GB RAM, 4 GB of disk space.

As published by the developer.

Can my PC run Klaus Veen's Treason?

The published requirements do not name a graphics card we can compare.

Set up my PC →

Minimum

OS: Windows® 11 (32/64-bit)/10/7/Vista
Processor: 1.7 GHz Processor or better
Memory: 1 GB RAM
Storage: 4 GB available space
DirectX: Version 9.0b

Does Klaus Veen's Treason have co-op or multiplayer?

Yes: co-op online and LAN; PvP online and LAN. There is no single-player mode.

Does Klaus Veen's Treason 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 text entry requires manually opening the on-screen keyboard
The native resolution is not the default one
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: Keyboard and mouse
Platforms: Windows, Linux
Achievements: 27
Steam features: Cloud saves, Family Sharing
Languages: Full audio: English.

Does Klaus Veen's Treason 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