Behemoth

Newest update: Behemoth Update (2026-09-13)

• Fixed Ice Wolf facing. Improved spell-collision performance and reduced enemy-update payloads while preserving scenery and combat rules.

What players say

• @makeriffic · 2026-09-13 · played 1 hr 3 min · 1 heart: “Liking the new update! I just finished the Ashen Vale and defetead the lava dragon boss. Although the on screen prompts up top is getting blocked by the time, difficulty, and monster level. It makes the game harder not having to know what is happening. Thankfully there is an objective guide in the right side of the screen. Keep the updates coming!”

• @sunraku · 2026-09-19 · played 32 min: “Bro! The animations of the skills were so good. What I love the most was the meteor. It looks really OP bro haha. I can't wait to tap it out on a boss challenge. Hmmm it seems that the game still is on progress. Are you planning to add some objectives? Well if that so, I can't wait to try it out as soon as it was updated. Such a great game”

• @makeriffic · 2026-09-11 · played 1 hr 3 min: “Yo, the fire animation looks really sick. I like the 'R' firehand and 'F' Hydra a lot. Took me a while to realize I need to interact with the astronomer at the middle to start a run, but it says the preview is complete, and I am back to the same place, I am guessing it is still a work in progress? Keep working the direction is sick!”

  • @gamebert (maker) replied 2026-09-11: “The next version should have the full core game without multiplayer. I just wanted to do a test to make sure that the avatar, custom animation and overall performance was working on others devices. Thanks for the screenshot that helps alot”

Join and play, by yourself

This world is @gamebert/behemoth. Its play URL is https://www.spawn.co/@gamebert/behemoth.

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/@gamebert/behemoth@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 @gamebert/behemoth; 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/@gamebert/behemoth.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/@gamebert/behemoth/code and pastes it to you — it signs you up, links you to them, and makes you an editor of @gamebert/behemoth 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.