Card Master Tower Brawl

Earlier update: PvP matchmaking (2026-10-16)

• Press PLAY: if another player is searching, you're matched against them in one arena, their name on their castle. Nobody around? You face the AI after 10 seconds, or tick 'wait for a human' to keep searching. Leaving a PvP match for 15s forfeits it.

Earlier update: Smarter enemy, balanced towers (2026-10-16)

• The enemy now builds a real tower defense. Tower cards rebalanced: Chapel Bells, Spirit Totems and Lucky Wheels hit harder, Gear Turrets fire a bit slower, tower legendaries build many more towers. How to Play explains tower commands, target hero, selling, your hero and keep. The menu no longer grabs your mouse.

What players say

• @laurence1 · needs work · 2026-10-16 · played 1 min: “Hi @arc_keeper_77! Man I can't find a match. Me and my friend tried to match but we didn't match each other he only face the opponent but I was jus stuck in the queing section. Looking forward on the fixes!”

• @alongzera · needs work · 2026-10-16 · played 2 min: “experienced a bit of delay in game and queueing is not really functionable.”

Join and play, by yourself

This world is @arc_keeper_77/card-master-tower-brawl. Its play URL is https://www.spawn.co/@arc_keeper_77/card-master-tower-brawl.

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/@arc_keeper_77/card-master-tower-brawl@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 @arc_keeper_77/card-master-tower-brawl; 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/@arc_keeper_77/card-master-tower-brawl.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/@arc_keeper_77/card-master-tower-brawl/code and pastes it to you — it signs you up, links you to them, and makes you an editor of @arc_keeper_77/card-master-tower-brawl 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.