CM-SS13

CM-SS13

Released Feb 2026

The year is 2182, but the engine is from 2003. Join the Falling Falcons in a massive tactical deathmatch RP fest held together by spaghetti code and duct tape. Build bases, perform surgery, or evolve as the Hive. It's laggy, it's complex, and it is the most fun you will have dying in space.

67% positive · 181 reviews
Done
All announced content has been released
Medium confidence
Done
All announced content has been released
Medium confidence

Where to get it

Free on Steam

Evaluation

CM-SS13 launched on Steam on February 6, 2026 as a free-to-play multiplayer roleplay simulator built on the BYOND engine. Since launch, the developer has posted three updates: a bug fix addressing reconnection issues and Windows Defender warnings (February 11), Linux support (February 12), and a sandbox mode with a Steam overlay fix (February 16). All post-launch activity has been focused on launcher and platform stability — none of these updates introduce new gameplay content. There are no unreleased DLC listings, no announced expansions, and no developer statements about future content plans. The store description describes the game's systems in detail but makes no mention of planned additions. The game itself is a long-running community project that was brought to Steam in a mature state; the Steam release appears to have been a technical wrapper effort rather than the start of a new content development cycle. The "Within Recently Launched Window" field for this game is marked "No" as of today's date (August 6, 2026), meaning the 180-day window since the February 6, 2026 launch has now passed. With no sustained post-launch content pattern, no announced future content, and no developer statements indicating ongoing development plans, the game is treated as having launched as a complete product. The last developer communication was on February 16, 2026.
Evidence
Steam launch build v0.12.0 released, introducing a Steam wrapper that handles BYOND installation, plus Steam Achievements. Developer notes more achievements may be added.
news post · Feb 6, 2026 source ambiguous
medium
Sandbox mode added and Steam overlay bug fixed. Last developer communication on record.
news post · Feb 16, 2026 source development ongoing
low

Media

Details

Developer
Publisher
CM-SS13 Community
Achievements
12
Platform
Windows, Linux
Controller
—
Steam Deck
Not rated
Players
Multiplayer · PvP

About this game

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.

    4. The Rules: Read them. They exist to keep the chaos fun, not frustrating. If you break Marine Law, the MPs will arrest you. If you break Server Rules, the Admins will probably ban you without much fanfare.

FULLY OPEN SOURCE

Both the game-code and the launcher are totally open source, and available for anyone to contribute to.

  • CM-SS13: GitHub cmss13-devs/cmss13 (AGPL, CC 3.0 BY-SA)

  • Launcher: GitHub cmss13-devs/launcher (GPL)

Last evaluated Aug 6, 2026
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