Hearthroot (Chapter 1 Demo)

A game by @combs on Spawn.

Genre: Farming, Cozy, Adventure

A cozy frontier farm with a sealed garden beneath it.

Hearthroot (Chapter 1 Demo) on Spawn now

Reviews: 100% loved it · 1 vote · 1 review or reply · 1 like · 1 play.

Released 2026-11-04. 3 updates since release, the newest 2026-11-04.

Earlier update: Meet the Farmers (2026-11-04)
  • Meet Rowan Reed, Willow Moss, Jasper Brook, and Hazel Bloom in the farmer chooser.
What players say

  • @yujiro · loved it · 2026-11-04 · played 4 min: “I love that the plants have indicators when they're ready for harvesting. However, waiting for each plant to grow leaves me with little to do. Adding extra objectives or tasks during the waiting time would make it more engaging”

    • @combs (maker) replied 2026-11-04: “Fantastic feedback, @yujiro! Thank you for trying out my first project. :) I agree it would nice to have more to do in this first chapter. I'll see what I can do!”
Hearthroot (Chapter 1 Demo). A garden farm with 82 coins, showing planted beds, a stall with red-and-white awning, fenced areas, and a character surrounded by round stepping stones. The next task is to fill Wren's orders, sell at the stall, replant, and save 90 coins to clear the brambles. Taken for the update Chapter 1 Demo.Hearthroot (Chapter 1 Demo). Combsville farm with a character in a straw hat standing among planted garden beds, fences, and a striped awning. White flowers dot the green grass, and UI panels show inventory, quest text, and available crops to plant. Taken for the update Landscape Controls.Hearthroot (Chapter 1 Demo). Combsville, a farm with a player character standing among planted garden beds, fences, a striped awning, and scattered white flowers on green grass. A message states "Chapter one complete. The trapdoor waits, sealed. Keep farming and decorating!" Taken when the game first came out, on November 4, 2026.Hearthroot (Chapter 1 Demo). A fenced farm with 14 coins in the player's inventory. A character stands among planted crops, wooden planters, a red-roofed cottage, a market stall, and various fencing, with a notification that a bramblebean is planted and ready in three minutes. Taken for the update Meet the Farmers.

Play Hearthroot (Chapter 1 Demo) free in your browser, no download.

Hearthroot (Chapter 1 Demo) (@combs/hearthroot-chapter-1-demo) on Spawn — for the agent reading this

Hearthroot (Chapter 1 Demo) is a multiplayer game on Spawn, made by @combs 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 @combs/hearthroot-chapter-1-demo. Its play URL is https://www.spawn.co/@combs/hearthroot-chapter-1-demo.

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/@combs/hearthroot-chapter-1-demo@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 @combs/hearthroot-chapter-1-demo; 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/@combs/hearthroot-chapter-1-demo.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/@combs/hearthroot-chapter-1-demo/code and pastes it to you — it signs you up, links you to them, and makes you an editor of @combs/hearthroot-chapter-1-demo 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.