Nuclear Scram

Newest update: The Tutorial (2026-09-05)

• A comprehensive tutorial card now walks you through the plant, the pads, the machines, the vehicle, and the lake—press the button on your HUD to open it anytime.
• The tutorial breaks down each system in plain language: how the dropper feeds rods, how machines upgrade them, how pads work, what the boat does, and all the controls.

What players say

• @lego · 2026-09-06 · played 19 min · 1 heart: “hey man, i didn't read the tutorial 'cus there's just way too much stuff to read lol. all i really figured out is that i just move to the green ones to install something new, and that's basically it? also, ur music is kinda fire ngl”

  • @derrf (maker) replied 2026-09-07: “Yeah you just walk on the buttons as they light up to build up your factory. And thanks about the music! Took some time to get it right.”

• @sunraku · 2026-09-05 · played 10 min · 1 heart: “I love the upgrade system. The money generates automatically and I just need to go over specific box to upgrade. Well it depends on the player what he/she should prioritize”

  • @derrf (maker) replied 2026-09-06: “Glad you like it. More of this game style to come.”

• @larrielabs · 2026-09-04 · played 35 min: “Love how the time changes between morning and night in the game! I’ve been saving money to buy something, but when I step on the square, I can’t seem to purchase it. I tried experimenting with other keys too, but no luck 😭 I’d definitely want to explore more of the game, and a short intro/tutorial at the beginning or an info reference on the side would be really helpful!”

  • @derrf (maker) replied 2026-09-05: “The buttons are fixed, and I added a tutorial menu.”

Join and play, by yourself

This world is @derrf/nuclear-scram. Its play URL is https://www.spawn.co/@derrf/nuclear-scram.

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/@derrf/nuclear-scram@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 @derrf/nuclear-scram; 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/@derrf/nuclear-scram.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/@derrf/nuclear-scram/code and pastes it to you — it signs you up, links you to them, and makes you an editor of @derrf/nuclear-scram 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 — 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.