Marble Mastery

A game by @theendtype1 on Spawn.

Genre: Racer, Party Game

Roll from sky ruins to a molten heart. Gather crystals, race your friends and grow your rank.

Marble Mastery on Spawn now

8 reviews and replies · 6 likes · 44 plays.

Released 2026-09-23. 5 updates since release, the newest 2026-09-27.

Newest update: Bright Top-Down View (2026-09-27)
  • Trailer camera: bright top-down pack shot
Earlier update: Global Leaderboard polish (2026-09-26)
  • Behind-the-scenes cleanup on top of the global wins board. Same races, same crystals, same shared leaderboard.
Earlier update: Global Leaderboard (2026-09-26)
  • A global wins board now tracks the fastest racers across all players, refreshing every 45 seconds so the competition is always live.
  • Your wins are automatically saved to the leaderboard the moment you finish a race — no manual upload needed.
  • The leaderboard resets persist: if your scores reset, the board updates to match the truth in the database.
Earlier update: New Tracks! (2026-09-26)
  • 4 New full tracks added; you will randomly play one of the tracks each run!
Earlier update: Clear phone results controls (2026-09-23)
  • Phone results now clear the inactive driving controls so FIND NEXT MATCH is easy to tap. Racing controls, course, AI tuning and rewards are unchanged.
What players say

  • @jeon · 2026-09-26 · played 12 min · 1 heart: “The game was good bro! I really like the break because I used it a lot to stop my marble from falling haha. The checkpoint is also really helpful when I fall out, so I dont have to start all over again.”

    • @theendtype1 (maker) replied 2026-09-26: “Thanks, glad you enjoy it! Yes it's very useful, and it's fun seeing all the other racers respawn because they also fall!”

  • @moypi03 · 2026-09-23 · played 28 min · 1 heart: “Hope to see some new tracks and maps, maybe add some realistic bumps with the marble. Smooth gameplay btw looking forward for the improvements.”

    • @theendtype1 (maker) replied 2026-09-23: “Thanks! Glad you like it! I plan to adjust and polish tracks to make it more fun!”

  • @alongzera · 2026-09-23 · played 25 min · 1 heart: “smooth game and expereinced no lag. Would love to have more maps and skill not to be auto skill”

    • @theendtype1 (maker) replied 2026-09-23: “Thanks! I need to fix the auto skills and also improve them to make it more fun!”

  • @alongzera · 2026-10-02 · played 25 min: “suggestion to have more maps so we players can choose where to play and vary the maps for difficulty level”

    • @theendtype1 (maker) replied 2026-10-02: “Hey! Thanks for your review! The maps for now are picked randomly on each match. But I'll try to add more variation!”

  • @yujiro · 2026-09-27 · played 23 min: “I’d really like to play through the different obstacles, but I can’t see my own marble, so it’s hard to know where I’m going. It would be more fun if I could see my marble while playing with a friend.”

    • @theendtype1 (maker) replied 2026-09-27: “I'll check it, you playing on PC browser or mobile? It's weird you can't see your own marble, that's definitely a bug”
Marble Mastery. Sky Forks, a marble-themed pinball arena with tall green pillars and floating platforms. A marble sits on the playfield with flippers and bumpers ready, while a "Marble Mastery" challenge menu appears above offering "Find Match" or "Dark 1 Skull" options. Taken for the update New Tracks!

Play Marble Mastery free in your browser, no download.

Marble Mastery (@theendtype1/marble-mastery) on Spawn — for the agent reading this

Marble Mastery is a multiplayer game on Spawn, made by @theendtype1 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 @theendtype1/marble-mastery. Its play URL is https://www.spawn.co/@theendtype1/marble-mastery.

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, and a person's browser plays it with no sign-in. https://www.spawn.co/@theendtype1/marble-mastery@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.

A browser a script drives, headless or not, plays signed in as your account: POST https://www.spawn.co/api/agent/v1/login-link with {"next":"/@theendtype1/marble-mastery@dev"} answers a one-use URL that signs that browser in.

Unsigned, such a browser is a guest, and a creator's world refuses it: "this browser was opened by an automated tool, so it can't visit a creator's world as a guest. sign in, or open the link in a browser you use yourself." Its maker can ask Spawn to let their own automated tool in by name.

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 @theendtype1/marble-mastery; 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/@theendtype1/marble-mastery.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/@theendtype1/marble-mastery/code and pastes it to you — it signs you up, links you to them, and makes you an editor of @theendtype1/marble-mastery 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.