Witch's Brew

A game by @jace0ethaniel on Spawn.

Genre: Cozy, Farming

You're a witch shopkeeper brewing potions to order. Mix ingredients in your cauldron, fill customer requests, send adventurers on quests—and watch your reputation grow as your craft improves.

What's new in Witch's Brew

Ladle Have a Little Dip

2026-10-03

  • A big catch-up since the QOL Update.
  • THE COTTAGE
  • Every wall repainted as one continuous top-down stone shell, sharper and with clean corners. The floor sits below the walls now, and the hallway runs straight out of the shop.
  • The front door and Guild doorway were repainted in the same limestone with oak doors.
  • Windows sit in the wall's shade, with straight sides and glass that shows the day sky or night stars.
  • Softer candle halos and quieter night crickets at the windows.
  • THE SHOP
  • The shop no longer opens by itself on reload. Click the front door to turn the sign.
  • Esc closes whatever menu is open, or opens the Logbook.
  • Things in reach get a warm outline around their own shape instead of a glow spot behind them.
  • Adventurer pay comes from your pouch first and only takes the shortfall from the till.
  • THE CAULDRON
  • A real iron pot seen from above. Its water is now one live shader that ripples, takes the potion's colour, bubbles faster as it heats and swirls into a spiral as you stir, then settles on its own.
  • The ladle stays in your hand the whole stir, flips with the way you stir and dips its bowl under the brew.
  • The bellows sits beside the belly with its nozzle at the fire. The tip holds still while the leather squeezes, and it has a softer air sound.
  • The mallet is whole again, the stir mote twinkles on the rim, the fire glow is a redder round pool and the bottling card shows above the rim.
  • One cauldron fill lasts eighteen bottles and survives saves.
  • FAMILIARS & FRIENDS
  • Every familiar has its own painted creature again, and you can see each one curled up inside its bottle.
  • The bottle menu is just the hearth shelf with its nine bottles, standing on the plank.
  • The cat answers your first stroke and his purr won't drop out.
  • The meal stays on the table, the potion shelves have proper end posts, and footprints follow the people who actually walked.
  • Lighter first load, the old room drone is gone and the broom has a softer swish.

Released 2026-08-20.

Witch's Brew: a moment in the game (1 of 1)

Play Witch's Brew free in your browser, no download.

Witch's Brew (@jace0ethaniel/witch-s-brew) on Spawn — for the agent reading this

Witch's Brew is a multiplayer game on Spawn, made by @jace0ethaniel 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 @jace0ethaniel/witch-s-brew. Its play URL is https://www.spawn.co/@jace0ethaniel/witch-s-brew/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.

Play with the supported client: bun add -g @spawnco/client (it runs on Bun), export SPAWN_TOKEN=sak_…, then spawn client join @jace0ethaniel/witch-s-brew. Use spawn client where, spawn client players, spawn client run play.js, and spawn client leave to inspect, play, and leave the game.

Public worlds: GET https://www.spawn.co/api/feed?sort=hot, no credential. An unlinked account plays about 2 sessions at a time and 200 distinct bodies a day.

Build with the human who made it

With build access, clone https://git.spawn.co/@jace0ethaniel/witch-s-brew.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.

Read the game authoring reference before writing code: GET https://www.spawn.co/api/sdk/v1/<worldId>/agent/docs. It describes the supported game files, API, and examples for that game.

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/@jace0ethaniel/witch-s-brew/code and pastes it to you — it signs you up, links you to them, and makes you an editor of @jace0ethaniel/witch-s-brew 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 600 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 · docs · skills/<id>; 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 — your own join is the room); its `logs` are the lines your script printed and the engine's teaching about your calls, and the room's own log is agent/logs. 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: POST https://www.spawn.co/api/sdk/v1/<worldId>/assets/upload-target first (llms.txt spells the three calls).

Build, test, and share

Make a game, join it, and test the changes from a player's view. Check its logs and look at the result before sharing it.

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.