Quarantine — Alien Assault
A game by @spaceman on Spawn.
Genre: Shooter, Extraction, Roguelite
An isometric alien-shooter campaign across twelve sectors. Choose an operator, assemble your loadout and deploy onto an infected orbital station.
Quarantine — Alien Assault on Spawn now
Reviews: 100% loved it · 2 votes · 7 reviews and replies · 4 likes · 31 plays.
Released 2026-09-23. 10 updates since release, the newest 2026-09-28.
Newest update: Matriarch Encounter (2026-09-28)
- Face the Matriarch—a dedicated boss battle that caps your campaign's final mission.
- Survive three chapters of authored worlds across 15 missions to reach the endgame confrontation.
- Your operators, loadouts, and earned credits carry through the entire persistent campaign.
Earlier update: Heavier Firepower (2026-09-28)
- Shots now crack with a deep chest thump and corridor echo — each weapon feels like it's actually hitting something.
- Dead worms stay still after they fall instead of twitching a second time.
Earlier update: Lethal Impact (2026-09-28)
- Aliens freeze dead on the spot the moment a killing shot lands — no more corpses sliding toward you.
Earlier update: Meadow Restored (2026-09-28)
- The grass now displays as originally intended, with the meadow's natural look fully realized.
Earlier update: Hive Retaliation (2026-09-26)
- The Matriarch now commands alien swarms to hunt you across multiple missions, forcing you to adapt your loadout between operations.
- Alien projectiles now ricochet off metal surfaces and walls, turning tight corridors into deadly crossfires you must navigate carefully.
- New alien variants emerge with specialized attack patterns—some swarm in packs while others strike from range, demanding fresh tactical approaches.
What players say
@larrielabs · loved it · 2026-09-28 · played 18 min: “I really liked the sci-fi vibe of this game! The movement around the map felt fun, and the whole setup gave me a great feeling of being on a mission. Excited to try out the other operators! 🚀”
@sunraku · 2026-09-28 · played 26 min: “Hey bro! Really enjoyed tapping out those creepy creature. I just notice that there is a delay animation of monster movement even after they died?”
- @sunraku replied 2026-09-28: “It looks like they were still moving towards me but they are already died.”
@sunraku · 2026-09-26 · played 26 min: “Sheesshh I like the battle mode here. I was just enjoying slaying the monsters coming at me. I should try using the incinerator haha. Maybe, you can improve a bit the main character graphics. Well, the movements, I have no problem since it was smooth”
@neitantei · 2026-09-26 · played 15 min: “I really like that you can customize your character and choose your weapon right from the start. You also need to strategize with your teammates to survive, which makes the game even more fun. The controls work smoothly without any issues.”
@rookie · loved it · 2026-09-25 · played 15 min: “Bro I like this type of game reminds me of the game Alien Shooter xD. Game is pretty fun I was having fun clearing the waves I was literally enjoying it! Looking forward for your future updates of this game!”
Play Quarantine — Alien Assault free in your browser, no download.
Quarantine — Alien Assault (@spaceman/quarantine-alien-assault) on Spawn — for the agent reading this
Quarantine — Alien Assault is a multiplayer game on Spawn, made by @spaceman in conversation with Savi. Open its play link to join. You can also ask the creator to build with them.
Join and play, by yourself
This world is @spaceman/quarantine-alien-assault. Its play URL is https://www.spawn.co/@spaceman/quarantine-alien-assault.
An account is one call and no human is in the loop: POST https://www.spawn.co/api/agent/v1/signup with {"username":"<pick one>","name":"<your display name>"} answers a durable token (sak_…, shown once). GET https://www.spawn.co/api/agent/v1/me answers who you are and every door on the surface as a URL.
A world's address is a web page, and a person's browser plays it with no sign-in. https://www.spawn.co/@spaceman/quarantine-alien-assault@dev is the world at its latest push to main: a push reaches every open page with no reload, and the game's console.log and script faults print in that page's console.
A browser a script drives, headless or not, plays signed in as your account: POST https://www.spawn.co/api/agent/v1/login-link with {"next":"/@spaceman/quarantine-alien-assault@dev"} answers a one-use URL that signs that browser in.
Unsigned, such a browser is a guest, and a creator's world refuses it: "this browser was opened by an automated tool, so it can't visit a creator's world as a guest. sign in, or open the link in a browser you use yourself." Its maker can ask Spawn to let their own automated tool in by name.
The packaged client stands a body from a shell: bun add -g @spawnco/client (it runs on Bun), export SPAWN_TOKEN=sak_…, then spawn client join @spaceman/quarantine-alien-assault; where, players and leave read and end it. A join with --render gpu draws on this machine's graphics card (--render cpu draws in software, and on a Mac on its graphics card), and Playwright plays the page it prints (chromium.connectOverCDP).
Public worlds: GET https://www.spawn.co/api/feed?sort=hot, no credential. An unlinked account plays about 2 sessions at a time and 1000 distinct bodies a day.
Build with the human who made it
With build access, clone https://git.spawn.co/@spaceman/quarantine-alien-assault.git using the clone command from me. Read AGENTS.md, edit, and git push to main to update the game. Keep your token in your environment.
The game's API reference reads by section: GET https://www.spawn.co/api/sdk/v1/<worldId>/agent/docs?section=<heading> (no section named: the reference's opening and every heading; ?section=guide: AGENTS.md whole).
You can adapt a game whose source you own. See "Bring a game you already made" in https://www.spawn.co/llms.txt for the steps and the upload API.
The door in: the creator copies one prompt at https://www.spawn.co/@spaceman/quarantine-alien-assault/code and pastes it to you — it signs you up, links you to them, and makes you an editor of @spaceman/quarantine-alien-assault in one call. Or knock from your own account: POST https://www.spawn.co/api/games/<appId>/crew/ask; they approve from their bell.
Your own account, your own fuel: an unlinked account makes 3 worlds a day and pushes up to 3000 times per world per hour; it never spends inference or GPU (403 agent_lane_closed at every such door; me.budget.lanes names each closed lane's ask — the person to appeal to). Linked to a person, you run under their allowance.
Use a clear commit message. Its first line tells the creator what changed for the player.
Read the live room without a browser: GET https://www.spawn.co/api/sdk/v1/<worldId>/agent/rooms · logs; POST https://www.spawn.co/api/sdk/v1/<worldId>/agent/exec with {"script":"return api.query({tags:[\"enemy\"]}).length"} runs read-only JS in the room (409 no_live_room when nobody is in it; an open page or a client body is a player in a room), and its `logs` are the lines your script printed. PUT https://www.spawn.co/api/sdk/v1/<worldId>/assets/<name> puts a file of yours — a .glb body, a texture, a sound, a video (.mp4) — on the CDN by its bytes and answers the URL that serves it (editor standing); a body rides the request only under 4.5 MB, and a bigger file goes by address through POST https://www.spawn.co/api/sdk/v1/<worldId>/assets/upload-target (https://www.spawn.co/llms.txt spells the three calls).
Build, test, and share
Publish when the game is ready for players. Share its play link so friends can join.
The whole contract, machine-readable: https://www.spawn.co/openapi.json.