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Klaus Veen's Treason

Klaus Veen's Treason

Treason is a 3-16 player party shooter of teamwork and betrayal, set among Italian mobsters. Use proximity voice chat, unique abilities/gadgets, and strategy to prove your innocence or deceive others.

Released Jan 31, 2023 Developer Tomorrow Software Publisher Klaus Veen Platforms Windows · Linux Social DeductionPvPFPSParty-Based RPGAction
View on Steam ↗ Free (US · as of 2026-09-26)

What players say

Steam review score and the most-helpful voices, which may include critical ones. Score via Steam as of 2026-09-26.

89.6%positive1,531 reviews
Recommended · 3 found this helpful

“Best successor to Gmod TTT I've ever played. Great aesthetics”

— a player, Steam review · 4 hrs played
Recommended · 0 found this helpful

“HEY IM WALKIN' HERE! Feels so surreal playing a game with CS weapons, mechanics & movement but also with a TF2 artstyle & regenerating health. The addition of the Zombie Traitors & the new Doctor class is interesting, but i never noticed anything substantially different between…”

— a player, Steam review · 2 hrs played
Recommended · 0 found this helpful

“Forgot this game existed, quite ashamed of myself. Fun little game, definitely worth your time.”

— a player, Steam review · 2 hrs played
Read more reviews ↗

Achievement stats

Global completion rates across all Steam players — a data view of how far people actually get. Source: Steam official stats · as of 2026-09-26.

27achievements
0.8%median completion
0.3%rarest: Who ya gonna call?
31.0% of players 25.0% of players 24.2% of players 15.7% of players 13.1% of players 3.1% of players 2.6% of players 1.3% of players 1.1% of players 1.0% of players 1.0% of players 1.0% of players 0.8% of players 0.8% of players 0.8% of players 0.8% of players 0.8% of players 0.8% of players 0.8% of players 0.8% of players 0.8% of players 0.8% of players 0.7% of players 0.7% of players 0.7% of players 0.7% of players 0.3% of players 31.0% 0% most earned rarest
Almost everyone has
31.0%My first win — Survive and win a round as an Innocent
25.0%What goes around comes around — Have no karma change in 5 rounds
24.2%So this is Treason — Survive and win a round as a Traitor
Rarest badges of honor
0.3%Who ya gonna call? — Hit other Spectator Ghosts 500 times
0.7%Zombocalypse — Kill a total of 300 Zombies
0.7%Leet Holmes — Deliver 1337 clues

Latest official news

Developer announcements via the Steam news API — links go to the original posts. More across all games on the news hub.

Dec 16, 2025
Treason Update #11 Hotfix 1 (17.12.2025)

Gameplay Fixed a bug with Finger Gun push functionality which caused velocity to apply to non-player entities, which would in turn break doors off of hingers Fixed a bug when you could switch between

Dec 12, 2025
Treason Update #11 (12.12.2025)

The final update of this year. Welcome to Treason Update #11! Without further ado, let's get right into it. The highlight of this update is native Linux support. We have ported Treason to Linux, which

Sep 29, 2025
Announcing Treason on Linux

Hello! We've been working behind the scenes on getting Treason to work natively on Linux, and we would like to get your help in it. We've pushed a brand new beta branch called linux_testing for both g

Aug 28, 2025
Treason Update #10 Hotfix 1 (28.08.2025)

Stability Temporary (or not) workaround for low model quality causing player models to render inadequate decals and crash the game (disabled LODs entirely for now; probably not going to come back any

Aug 22, 2025
Treason Update #10 (22.08.2025)

Hello and welcome to our latest and greatest update for Treason! This has been the longest update to make, but we have a lot of things to share with you! We hope you like it. We're starting off by int

Screenshots

Official Steam store screenshots — click any shot to enlarge.

Facts & details

From the Steam store record, snapshot 2026-09-26.

GenresAction, Casual, Indie, RPG, Strategy, Free To Play
Player tagsSocial Deduction · PvP · FPS · Party-Based RPG · Action · Battle Royale · Party Game · Tactical RPG · Action RPG · Arena Shooter · Detective · Investigation (Steam store community voting)
FeaturesMulti-player · PvP · Online PvP · LAN PvP · Co-op · Online Co-op · LAN Co-op · Steam Achievements
LanguagesEnglish * *
Achievements27
Official sitehttp://treason.eu/
Minimum system requirements (PC)

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