Hammer Hill

Newest update: Hammer Hill Update (2026-09-15)

• Fixed permanent obby with verified platform support and old-layout cleanup; faster robot challengers with random hammer loadouts and restored names; improved overhead hammer swings; walk-through summit inlay and rock-edge recovery fixes; unreachable-target guard fix; solid player and bot collisions; empty-human live rounds end without losing saved progress.

What players say

• @larrielabs · 2026-09-15 · played 10 min · 1 heart: “Yooo! This game really summoned the competitive side of me HAHAHA 😭🔥 It would be so fun to play this with my friends and see who can come out on top! 👀🏆✨”

  • @bryn (maker) replied 2026-09-15: “Thank you so much !! This is my first spawn game ive made, this means a lot to me ! :)))”

• @alongzera · 2026-09-23 · played 11 min: “really love how chaotic when you get on top of the hill and satsifying if you can get someone off the hill too lol”

• @yujiro · 2026-09-21 · played 15 min: “I’m really intrigued by Hammer Hill and wanted to see more of the gameplay, but I got stuck on the ready page and couldn’t see my character. Because of this, I wasn’t able to properly experience the game or understand its main goal. I’d definitely give it another try once the issue is fixed.”

• @noor · 2026-09-18 · played 6 min: “omg the bot just beat me am i being skilled issue or is the game hard ahah i love the character design its reminds me of someone from anime great game”

• @kaya · 2026-09-17 · played 7 min: “hahaha it was so funny seeing 8+ people trying to steal the crown from each other while swinging massive hammers. definitely a good one for your first spawn game! i would say things that need improvement here are a proper fighting arena, a main menu, and a "How to Play" section so that players would get the direction of the game. keep it up, bryn! <3”

Join and play, by yourself

This world is @bryn/hammer-hill. Its play URL is https://www.spawn.co/@bryn/hammer-hill.

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/@bryn/hammer-hill@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 @bryn/hammer-hill; 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/@bryn/hammer-hill.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/@bryn/hammer-hill/code and pastes it to you — it signs you up, links you to them, and makes you an editor of @bryn/hammer-hill 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.