- Treason Update #11 Hotfix 1 (17.12.2025) - 16 December 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 two different Gadget weapons and end up with no weapon in hands after using the last Gadget Increased default Spectator Ghost Hat speed from 2048 to 2304 u/s Maps City Fixed issues with clues Thank you for sticking with us! Merry Christmas & Happy New Year!
- Free 3-16 player party shooter of teamwork and betrayal, Klaus Veen's Treason added Linux support - 15 December 2025
Ready for the holiday period, Klaus Veen's Treason is a fun looking 3-16 player party shooter of teamwork and betrayal that now has Native Linux support. Read the full article here: https://www.gamingonlinux.com/2025/12/free-3-16-player-party-shooter-of-teamwork-and-betrayal-klaus-veens-treason-added-linux-support/
- Treason Update #11 (12.12.2025) - 12 December 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 was quite more complicated than just hitting "compile" on the source code. Be warned, if you had Treason installed before with the Windows build on your Linux machine, you MUST uninstall the game completely and reinstall it again, because of capitalization issues with our assets that Steam does not fix with an update, only with a full reinstall. Can't do anything about that, sorry! The rest of the update was focused on implementing feedback from you, our community, after a very complicated update #10, which took a lot of our time. Thank you for helping us shape the game to make it better! We promise to keep updating the game with more exciting stuff in 2026! Full list of changes Stability…
- Announcing Treason on Linux - 29 September 2025
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 game client and dedicated server and we would like you to test it out before we can officially push it to the main game. It is compatible with the public build, meaning you can connect from Linux beta to public servers running the main Windows build. To download a Linux dedicated server, you can use steamcmd: steamcmd +login anonymous app_update 1875500 -beta linux_testing validate Please direct your feedback to our Discord server at https://discord.gg/fGvfTyYGge. Thank you for sticking with us!
- Treason Update #10 Hotfix 1 (28.08.2025) - 28 August 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 time soon, unfortunately) Please let us know if you still experience graphical glitches with decals. Thank you for sticking with us!
- Treason Update #10 (22.08.2025) - 22 August 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 introducing global Steam Leaderboards. This is launching as an experiment, so we've only added a handful of things to track, but more are coming in the future! Right now they include total score earned, number of bombs planted, number of players revived and number of clues delivered. These leaderboards can be tracked in multiple time ranges, too: today, this week, this month, this year and lifetime (since this update!) Next up, we did a major overhaul to abilities. Many of you asked us for a way to re-arrange your abilities, and we heard you! We have added an entirely new loadout section when you join a game, where you can re-arrange your abilities however you like (except the first ability fo…
- Treason Update #9 Hotfix 1 (18.06.2025) - 17 June 2025
Stability Fixed server crash when rapidly disconnecting and re-joining the same server Fixed an exploit related to player packet loss We are currently working on a pretty big update and it's coming very soon! Thank you for sticking with us!
- Treason Soundtrack Release Party - 10 January 2025
This event is all about bringing new and veteran players together to experience the thrill of Treason—the mafia-themed game where wit, intuition, and deception rule the day. Whether you’re a seasoned strategist or just starting out, you’ll have the chance to join in on intense rounds of gameplay and see how players bluff, strategize, and work their way through tricky situations. We’re so grateful for all the support you’ve shown over the years—thank you for sticking with us and making this community so amazing. Let’s dive into the unpredictable world of alliances and betrayals, celebrate the game, and have some fun! Have a nice weekend, Klaus
- Treason Update #9 (18.12.2024) - 18 December 2024
For the final time this year, welcome back to the new update! We've got something special for you this time... The biggest addition of this update is introduction of friend lobbies! You can now play with your friends without occupying a public server with just one press of a button, powered by P2P networking from CoaXioN Coplay. This was a highly requested feature and we hope it will encourage players to play more and keep the community friendly. Of course, Christmas is coming and we want players to feel that way in Treason too! So we've updated the main menu to feature snow and a nice Christmas-themed soundtrack, as well as updating Villa to reflect this change, too. Full list of changes Stability Fixed a crash when pressing a scoreboard button when the game is loading into the menu Fixed a crash when pressing a number key that isn't assigned to any class in class selection menu Gamepl…
- Treason Update #8 (31.10.2024) - 31 October 2024
Welcome to our longest update in the making thus far! We've continued to expand on the gameplay in many different ways, so we hope it was worth the wait. Player classes Please welcome some new faces to our ranks: the Light and Heavy classes! With this update, you now get to choose between three classes, each with its buffs and nerfs. These gameplay modifiers do not apply in Annihilation, and when you play as special roles (Detective & Doctor) or Zombies. Light class The fastest of all, but also the weakest 80% health 110% speed Adrenaline ability Damage with heavy weapons +15% Damage with shotguns +15% Medium class Our old friend 100% health 100% speed Heal ability Damage with heavy weapons +7% Damage with sniper weapons +7% Heavy class A tough guy who eats bullets for breakfast and has a weapon that costs $400.000 to fire for 12 seconds 110% health, regeneration (+1 HP per second) 90%…
- Update #8 Release Date - 25 October 2024
Welcome back, mobsters. We have some special news for you: update #8 will release on October 31st, 2024! Watch out for new faces within our ranks...
- Treason Update #7 Hotfix 2 (03.04.2024) - 3 April 2024
Gameplay Changed default power supply toggle time to 2 seconds (t_cpu_powersupply_toggle_time) Replaced Troy pseudo name with Rolo UI Potentially increased fidelity of HUD progress bar Maps Fixed some missing polygons Updated Don spawn positions Updated Zombie Don syring spawn positions Thank you for sticking with us!
- Treason Update #7 Hotfix 1 (28.03.2024) - 28 March 2024
Stability Fixed a rare server crash when a player was in pre-death state and the round restarted during that period Fixed very rare instances of kick vote permanently preventing a player from re-joining, if a level change has occured shortly after a kick vote Gameplay Fixed Don glow sometimes missing "Can I play, daddy?" achievement no longer requires you to open your profile menu to unlock Changed default clue glow start delay to 6 seconds (t_dev_clue_glow_start_delay) Changed default non-Doctor Radar ability cooldown to 25 seconds (t_radar_cooldown) Potentially fixed all cases of becoming a Zombie in the beginning of a new round Zombie Don syringe model will no longer keep floating mid-air after dying Updated pseudo names UI Added a separate color and sound for Detective Radar event Fixed round end panel showing lots of duplicated kills in Annihilation Increased fidelity of HUD game e…
- Treason Update #7 (24.03.2024) - 24 March 2024
We're back with another update! This time, we've got quite some interesting stuff for you to look at. Please share your feedback with us! Some of you might've already noticed it on our Steam Store page, but we added Steam Achievements! With that, we've also added some new Steam Stats for them! Playing Treason now has more reward than ever. We've added a C.P.U. Power Supply™️. Traitors are now able to turn it off to shut down the C.P.U. and all electric lights around the map. You can use it to stop clues from being processed altogether. One more big thing to talk about is our addition of the Zombie Don! Whenever there's only one innocent left, an event triggers that says there's only one innocent left. Now, with that event you will see a special syringe spawn somewhere on the map, that only the Innocent would be able to locate and pick up. After doing so, they can walk up to the Don's bo…
- Treason Update #6 (31.01.2024) - 31 January 2024
First update of the year and today the game turns one year old! Please share your feedback with us! We got a brand new gun in stock today for you! Remington Model 81 is a powerful 5-round rifle, capable of quickly disposing of those pesky Traitors. We've added a brand new Shield ability for the Detective and during Annihilation. It lasts t_shield_duration seconds (default: 5) and lets you take t_shield_damage_multiplier of damage (default: 70%) with a cooldown of t_shield_cooldown seconds (default: 20) We've also re-arranged all of our abilities on the HUD to be a bit more convenient in combat, which means your old muscle memory will have to re-learn the bindings. Sorry for that! Full list of changes Stability Fixed graphical glitches when setting texture quality lower than "Very High" Gameplay Added Remington 81 (see above) Added Shield ability (see above) Fixed semi-auto weapons not f…
- Klaus’ B-Day Treason Bash - 2 January 2024
Thanks for being a part of our little Treason community! Best wishes, Klaus Veen
- Treason's Winter Season - 22 December 2023
Celebrate the Christmess season in Treason. Veterans and newcomers alike come together for a festive night of deception. Whether you're an innocent trying to sniff out the traitors, a traitor trying to take down the innocents, the detective trying to solve the case or the doctor arriving to late to ressuscitate? Join Treason tonight, there is something for everyone. And the best part? It's free! It warms my heart to see how far we've come and I want to thank all of you that's sticking with us, we had alot of fun this year. Up to the next one! The Don sends his rega... *murdered* Happy Holidays, Klaus
- Treason Update #5 (21.12.2023) - 21 December 2023
We are back with the last update for this year! Please share your feedback with us! First thing we introduced is Steam Rich Presence. Now whenever you see your friend playing Treason, you'll see what map they are playing and how many players they have on their server while also being able to join them by clicking RMB on them in friends' list and then "Join Game", as long as they are not playing on a LAN server. Next big thing we added is a server creation UI. Initially we wanted to make a fully working lobby system with players being able to create their own lobbies with their own settings, but unfortunately it turned out to be impossible in our current situation so we decided to at least bring a common Source server creation UI to the game, although with a prettier layout, which functions almost the same to the lobby system, except you will still have to deal with port forwarding or us…
- Vote For Treason! - 21 November 2023
We'd like to invite you to nominate Treason for the upcoming Steam Awards 2023. Thanks for sticking with us, Klaus
- Treason Froit Noit! - 28 October 2023
Attention goons of all ranks and experience levels. Hope y'all like the update! :) Join us for a special Treason Fright Night, where veterans and newcomers unite for a spectacular evening of betrayals and shenanigans. Have fun! Klaus
