Starfrost Kart

What players say

• @laurence1 · 2026-09-07 · played 14 min · 1 heart: “I love the game reminds me of beach buggy xD. I suggest like you add some control legends or pre-lobby overall the game is fun I had fun playing with it!”

• @makeriffic · 2026-09-03 · played 13 min · 1 heart: “It was very fun and chaotic at the same time haha. I love that the bots can also get the powerups and sabotage each other. You can maybe add a shield powerup to protect those that are in the first place, because it is really hard maintaining it with all the projectiles getting thrown at you lol.”

  • @seele (maker) replied 2026-09-04: “As a matter of fact there is a shield already inside the game, although im not sure the % to get it, i saw it only once in all the tests. About the difficulty i didnt told Savi anything about it, and i find it rather easy so perhaps idk make difficulty settings? rankings? idk, i didnt had in plan to keep working on it but now it is on the list, thanks for that”
  • @makeriffic replied 2026-09-04: “Oh, so there is a shield. I haven't encountered it in 3 rounds of 3 laps lol. Maybe the percentage is just that low. Anyway, I agree that the difficulty is kind of easy, maybe you can add a varying one with bot levels to make it more challenging for experienced players.”

• @lego · 2026-09-03 · played 19 min · 1 heart: “you gotta make this big, i love it! seriously, this has so much potential. really looking forward to seeing what u add next!”

  • @seele (maker) replied 2026-09-03: “This was a 1 prompt game, although now seems like i really should work on it more, thanks for telling me that”

Join and play, by yourself

This world is @seele/starfrost-kart. Its play URL is https://www.spawn.co/@seele/starfrost-kart/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/@seele/starfrost-kart@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 @seele/starfrost-kart; 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/@seele/starfrost-kart/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.