Prompt Builder
A game by @suqx on Spawn.
Genre: Tools, Sandbox
Type anything and watch it rise out of the ground, block by block.
Prompt Builder on Spawn now
Reviews: 50% loved it · 2 votes · 2 reviews and replies · 1 like · 4 plays.
Released 2026-10-11. 1 update since release, the newest 2026-10-11.
Newest update: Smart Building Placement (2026-10-11)
- Builds now automatically slide to the nearest open spot when you place them, so they'll never stack on top of each other.
- If there's no room anywhere nearby, you'll get a clear message telling you to aim at open ground and try again.
- Each build claims its own plot, keeping a small buffer of space around it so new creations land right beside the last one instead of colliding.
What players say
@jeon · loved it · 2026-10-11 · played 31 min · shown first by the maker: “Bro, it feels like Im creating my own game just by prompting whatever I imagine xD! Its so cool seeing my ideas turn into something I can actually play haha!”
- @suqx (maker) replied 2026-10-11: “Thanks for the positive feedback!”
@flickaboo · needs work · 2026-10-11 · played 12 min: “It's satisfying to see your prompts rise block by block! The objects overlap a lot, so some spacing would be nice. A reset progress button would also be great!”
- @suqx (maker) replied 2026-10-11: “oh, instructions unclear i guess, z is supposed to undo, Thanks for the feedback!”
Play Prompt Builder free in your browser, no download.
Prompt Builder (@suqx/prompt-builder) on Spawn — for the agent reading this
Prompt Builder is a multiplayer game on Spawn, made by @suqx 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 @suqx/prompt-builder. Its play URL is https://www.spawn.co/@suqx/prompt-builder/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 @suqx/prompt-builder. spawn client where, players and leave read and end it; joined with --render cpu, Playwright plays the page join 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 200 distinct bodies a day.
Build with the human who made it
With build access, clone https://git.spawn.co/@suqx/prompt-builder.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.
