

CM-SS13
CM-SS13 Devs · February 6, 2026 · Top-Down Shooter, Sandbox, RPG, Military, PvP
CM-SS13 is free to play — no purchase needed. We track it so you know if that ever changes.
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CM-SS13 price
CM-SS13 is free to play — there is no purchase price, on Steam or anywhere else we track. We keep watching it, so if it ever stops being free the price history on this page will show when that happened and what it changed to.
About CM-SS13
CM-SS13 is a massively multiplayer tactical roleplay game set on a distant colony where you command or fight as a Marine responding to a distress signal, managing everything from squad tactics and logistics to complex medical procedures while battling xenomorphs and navigating corporate interests. Built on the ancient BYOND engine, it delivers emergent storytelling through destructible environments, full chain-of-command roleplay, and the chaotic unpredictability of dozens of players screaming over comms while trying not to shoot their own feet.
The year is 2182. High Command has dispatched the USS Almayer to the frontier. You are a member of the Falling Falcons - 2nd Company, 2nd Battalion, 4th Brigade.Your orders are simple: Respond to an unknown distress signal, secure the colony, and neutralise any threats. But on the rim of known space, nothing is ever simple.
BYOND: Build Your Own Net Dream
Built on the ancient, accursed, yet still beloved BYOND platform, this isn’t regular SS13; it's a completely overhauled multiplayer roleplay tactical disaster simulator. It looks like a game from the 90s, plays like a milsim from the future, and breaks like a cheap lawnmower.Whether you are holding the FOB, performing open-heart surgery in a sand pit, or playing a xenonid trying to figure out how to open a door, your actions define the round. Every bullet must be accounted for, every wound requires surgical precision to treat, every host must be incubated, and every order must move down the chain of command.KEY FEATURES
- Massively Multiplayer: Theoretically high player counts allow for full company-scale operations, meaning lots of people screaming over the radio at once or complaining that the Empress is micromanaging the hivemind.
- Complex Medical System: Health isn't just a bar. Treat broken bones, internal organ failure, and overdoses. If the xenonids don't kill you, the medic mixing up the labels on the pill bottle might.
- Destructible Environments: Blow open walls with C4, weld doors, or burn down the entire jungle because you saw a spider.
- Logistics & Command: The war isn't won by shooting alone. It’s won by the shipside support crew, including the Requisitions Officer, who orders the ammo for your rifle, and the Executive Officer, who really didn't mean to accidentally orbital bombard Delta Squad.
- Roleplay First: Immerse yourself in the hierarchy. Follow orders, shout tactical info over the radio, and engage in the unique "culture" of the Falling Falcons.
- Emergent Storytelling: Will you hide in a locker for 45 minutes as a suvivor? Will you robust a xenonid with a toolbox? Or will you succumb to liver failure after finding the colony's vodka stash?
- Corporate Interests: Roleplay as a Liaison from a shadowy company that cares more about the quarterly profit margins than your survival.
- Hostile Third Parties: Sometimes it’s insurgents. Sometimes it’s high-tech hunters. Sometimes it’s just the Military Police arresting you for not wearing your helmet. ⚠️ WARNING: READ BEFORE ENLISTING ⚠️ 1. Ancient Technology: This game runs on BYOND. When you click "Play" on Steam, it will install the BYOND requirements for you. Yes, you sometimes will get an popup for Byond Premium when it boots up. Lummox JR has to eat somehow. 2. The Learning Cliff: The controls are not intuitive. You will accidentally shoot your foot. You will drop your gun in the middle of a firefight. You will struggle to open a bag of chips.The UI looks like the cockpit of a 747-800. Take a moment to read the starter guide, call a Mentor (F1), or just ask the Marine standing next to you how to put your helmet on. We were all bald and confused once.3. Roleplay Expectations: aka Yes, you have to play as a Character. This is a Medium Roleplay (MRP) environment.
- Names: Name your character something believable, not "xx_Headshot_King_xx" or "Obi-Wan Kenobi."
- Behaviour: You are a Marine (or a giant bug). Act like one. If you run around griefing your teammates or screaming internet memes in the chat, you will probably hear the dreaded Bwoink. That is one of our volunteer Moderators coming to have a very polite conversation with you about your life choices.
CM-SS13 — game info
- Platforms
- Windows, Linux / SteamOS
- Player modes
- Online PvP, Cross-platform multiplayer
- PC Game Pass
- Not included
What Steam players say
Recent verbatim reviews from Steam — separate from playze.io community reviews below.
CM-SS13 is a deeply complex multiplayer tactical experience set in the Alien universe where players coordinate as Marines fighting xenomorphs across dangerous colonies, featuring intricate systems for combat, supply management, and role specialization that reward communication and knowledge over twitch reflexes. Players praise its surprising depth hidden beneath dated BYOND graphics, the variety of roles available, and its active community, though they note the steep learning curve and text-based communication require significant patience and investment to enjoy.
CM-SS13 is one of those games that looks incredibly basic at first but turns out to be ridiculously complicated once I actually start playing. It is a free multiplayer roleplay game built around Space Station 13, but heavily changed into a tactical Colonial Marines experience. I am dropped into the year 2182 as part of the Falling Falcons and sent into dangerous colonies where I might be fighting xenomorphs, treating wounded marines, running supplies or trying to keep the whole operation organised. The old BYOND engine makes it look like something from another era, but underneath the simple graphics there is a huge amount going on. The amount of detail is probably what impresses me most. Combat is not simply pointing a gun and shooting until something dies. Ammunition, equipment, positioning, orders and logistics all matter, while the medical system goes far beyond having a normal health bar. I can deal with broken bones, internal injuries, organ problems and overdoses, which makes getting wounded feel like an actual problem that needs to be dealt with rather than something that disappears after a few seconds. Even the environment can become part of the battle because walls can be…3 found this helpful
CM-SS13 is a highly specialized multiplayer experience that blends military role-playing, tactical combat, survival horror, simulation mechanics, and large-scale cooperation into a deliberately complicated package. Developed by CM-SS13 Devs and published by CM-SS13 Community, it is clearly aimed at players who appreciate systems-driven games where communication and knowledge are every bit as important as mechanical skill. Its old-school presentation may appear modest at first, but the simplicity of the graphics hides a surprisingly sophisticated simulation in which dozens of players can contribute to an unfolding military operation. The central scenario revolves around personnel aboard the USS Almayer responding to trouble at a remote colony. Marines are deployed to investigate the situation, but what follows can rapidly develop into a violent confrontation between organized human forces and a hostile xenonid hive. This asymmetrical structure gives the two factions substantially different experiences. Marines depend on firearms, equipment, communications, defensive construction, medical treatment, logistics, and a functioning command structure. Xenonids instead rely on biological …2 found this helpful
The trailer is awful but the game is deep, beautiful and with an awesome (but small) community around it. There's something for everyone there's elements of a shooter, management game or an arcadey fighting game involved here. Awesome and irreplaceable, the negative reviews are primarily from people who have been banned from the server.1 found this helpful
the steam launcher is screwy, how it interacts with achievements and the other accounts
i mean its just cmss13 from byond i already had 150+ hours on there.
Game is amazing, all the bad reviews are from people who love this game as well but they are mad that they got banned for breaking the rules on this private server and now have hurt feelings cause it is or was there favorite game. Believe me, I would be pissed off if I got banned from the server cause I love the game a lot. Best Aliens game on the internet by far. Free to play private open source server/game run and made by a community. Be apart of the community and login and play. The game is a PVP Marines Vs Aliens deathmatch. Rounds take 1-3 hours to complete and you can join mid round. It is one of the space station 13 game servers. All communication (talking to others) is by text no voice chat. It has the most unique game controls using a hand system that may take a bit to get used to. You start on the marines ship waking up from cryogenic sleep after a long space travel to a distant colony. Gear up and make your way to the briefing where the commanding officer (also a player) will tell everyone their plan. There are 50-100 other marines all with different jobs and varying levels of ship access. Every person you see in this game is another player and each has a specific j…
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