Free to playCM-SS13
The year is 2182 and the engine is from 2003. CM-SS13 drops you into huge Falling Falcons operations against a xenonid hive, where every bullet, wound, order, and supply crate matters. It is janky, strict about roleplay, and completely unlike anything else when a round clicks.
Is CM-SS13 worth it?
CM-SS13 is worth it if…
- you like huge team operations where logistics and orders matter as much as aim
- you like playing medic, engineer, pilot, or alien as much as frontline infantry
- you like roleplay chaos and stories where plans fall apart in funny ways
Screenshots
Marines against the hive
You ship out aboard the USS Almayer, answer a distress call, and land in a colony fight that rarely goes to plan. Marines hold ground with rifles, C4, welded doors, mortars, and orbital support. Xenonids answer with claws, numbers, ambushes, and hosts to incubate.
Rounds run at company scale, with dozens of voices on the radio and orders moving down the chain of command. You drop a smoke, build a barricade, miss a shot, get dragged off, and wake up as someone's incubation project. That is a normal Tuesday here.
A job for every kind of trouble
Shooting is only half the war. You can hold the FOB as an engineer, triage broken bones and failing organs as a medic, file requisitions for ammo, fly dropships, police helmets as military police, hide as a survivor, or scheme as a corporate liaison.
The medical system has no simple health bar to hide behind. Broken bones, organ failure, and overdoses all need the right treatment, and a mislabeled pill bottle can finish what the hive started. Shipside crews who never fire a shot often decide who lives.
Jank, rules, and beautiful disasters
This runs on BYOND, looks like the 90s, and controls like the cockpit of a jumbo jet. You will fumble your rifle, struggle with a bag of chips, and call for a mentor on F1. Everyone starts bald and confused.
It is medium roleplay with believable names and a chain of command. Follow orders, stay in character, and read the rules, because marine law and server rules both bite. Burn down the jungle because you saw a spider, just be ready to explain yourself.
Good to know before you enlist?
How do you actually get into a match?
Pick a role, gear up aboard the ship, attend briefing, and take the dropship planetside. Or evolve with the hive instead. You can also join as an observer and watch the operation fall apart in real time.
Can you play as the aliens?
Yes. The xenonid side plays completely differently, built around hive cooperation, evolution, and specialized biological roles rather than guns, ammo, and supply lines.
What do you need to run it?
Pressing Play installs what BYOND needs to run the game. Expect old visuals, some lag, and a busy interface. The code and launcher are open source for anyone who wants to tinker or contribute.
