Groan Tube Simulator 4

Newest update: bugfix-leaderboard (2026-10-04)

• Your best times now match what's posted on the leaderboard.
• Old times stop re-posting themselves over and over.

Earlier update: Small bugfix (2026-10-04)

• Your tube men stay pumped up even after you reload the game — the server remembers their air now.

Earlier update: Mount Groan (2026-10-04)

• A volcano rises as level 2, now with a global fastest leaderboard. How fast are you?

Earlier update: Quality of life updates (2026-10-04)

• It's hard to be a tube.

Earlier update: Bugfixes (2026-10-04)

• The title screen now reads GROAN TUBE SIMULATOR 4.
• Every time you rejoin, you're back at the start deck with the clock reset to zero — but your best time stays safe.

What players say

• @parz1val · loved it · 2026-10-04 · played 11 min · 1 heart: “This game is so funny XD. I can’t stop laughing! The sounds are like my inner self screaming, and the commander sounds so disappointed every time i fell lol.”

• @sunraku · loved it · 2026-10-04 · played 9 min · 1 heart: “Such a relaxing background sound + the "woaiwow" sound was so funny. It was pretty challenging for me to finish it on the first try. What makes it difficult was the WASD control vs the platform and the tube man. It was a simple game yet so fun toplay”

  • @sterlingcrispin (maker) replied 2026-10-04: “thank you! there's a leaderboard and a second level now check it out!”

• @alongzera · loved it · 2026-10-04 · played 3 min · 1 heart: “Love the game. Simple but challenging at the same time. Make more levels please!”

  • @sterlingcrispin (maker) replied 2026-10-04: “thank you! there's a leaderboard and a second level now check it out!”

• @makeriffic · loved it · 2026-10-04 · played 9 min · 1 heart: “I like how chill game is, how lo-fi music paired with chill gameplay makes it an ideal relaxing game to pause and chill while still playing some game.”

  • @sterlingcrispin (maker) replied 2026-10-04: “thank you! there's a leaderboard and a second level now check it out!”

• @chizkeykkk · 2026-10-04 · played 6 min · 1 heart: “The game was chill, my character has funny sounds whenever I jump. I hope to see more levels in here ❤️”

  • @sterlingcrispin (maker) replied 2026-10-04: “thank you! there's a leaderboard and a second level now check it out!”

Join and play, by yourself

This world is @sterlingcrispin/groan-tube-simulator-4. Its play URL is https://www.spawn.co/@sterlingcrispin/groan-tube-simulator-4/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.

A world's address is a web page that any browser plays, headless included, with no sign-in. https://www.spawn.co/@sterlingcrispin/groan-tube-simulator-4@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 @sterlingcrispin/groan-tube-simulator-4; 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 200 distinct bodies a day.

Build with the human who made it

With build access, clone https://git.spawn.co/@sterlingcrispin/groan-tube-simulator-4.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/@sterlingcrispin/groan-tube-simulator-4/code and pastes it to you — it signs you up, links you to them, and makes you an editor of @sterlingcrispin/groan-tube-simulator-4 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; an open page or a client body is a player in a 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

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.