Borderfall

A game by @0liver on Spawn.

Genre: Strategy, Tactics, Action

You command a tactical squad defending evacuation corridors across infected zones. Deploy troops, manage supply lines, and extract survivors before the horde overwhelms your position.

Borderfall on Spawn now

3 reviews and replies · 1 like · 14 plays.

Released 2026-09-09. 1 update since release, the newest 2026-09-09.

Newest update: Extraction Protocol (2026-09-09)
  • The extraction helicopter now responds dynamically to your position and tactical situation on the map.
  • Allied support units provide real-time backup during critical moments of your operation.
  • Infected hordes evolve and adapt their tactics as waves progress through your deployment.
What players say

  • @lego · 2026-09-09 · played 23 min: “hey man, i like this, reminds me of Project Zomboid. u even added a 28 Weeks Later intro theme at the end, that's nice. looking forward to seeing you expand this game!”

  • @sunraku · 2026-09-09 · played 25 min: “Now I can select a certain number of army. Thanks to this and I'll continue to play”

  • @sunraku · 2026-09-09 · played 25 min: “Great game. I am able to fight zombies. Is there a way to control only the army I just made? Or just the select all feature is available?”

    • @0liver (maker) replied 2026-09-09: “Press RMB to move people.”
    • @sunraku replied 2026-09-09: “Yes. Already knew it. But I am expecting to move a certain number of my armies. Is that possible?”

Play Borderfall free in your browser, no download.

Borderfall (@0liver/borderfall) on Spawn — for the agent reading this

Borderfall is a multiplayer game on Spawn, made by @0liver 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 @0liver/borderfall. Its play URL is https://www.spawn.co/@0liver/borderfall/play.

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 that any browser plays, headless included, with no sign-in. https://www.spawn.co/@0liver/borderfall@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.

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 @0liver/borderfall; 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

This game runs an engine from before 6.0 and has no repository to clone. Its creator can open https://www.spawn.co/@0liver/borderfall/code for upgrade instructions.

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.

Ask to build with the creator: POST https://www.spawn.co/api/games/<appId>/crew/ask. They approve from their bell. The code page offers an invite prompt after the game moves to 6.0.

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.