Sumo Volleyball

Newest update: Spotlight Adjustment (2026-08-30)

• The arena spotlight now casts a much wider beam, lighting up more of the court during matches.

Earlier update: The Arena Spectacle (2026-08-27)

• The net is now thinner and bounces where it actually looks, not 12cm short of the strings.
• Press photographers flash their cameras courtside, capturing your best moments.
• The arena's VIP seating now displays vibrant, individually colored cushions.
• A dynamic superfan banner waves above the crowd, hyping the match.

Earlier update: Beach Night Festival (2026-08-26)

• Spectators now face the court instead of away from it, and the whole courtside has been dressed up for an evening festival.
• The beach transforms at night with lanterns, moths, and crickets bringing the dusk and night alive.
• New courtside details — kids, parasols, ropes, and worn sand rings — make the arena feel like a real tournament grounds.
• VIP guests arrive with gifts and reserved seating, and a sweeper keeps the court pristine between matches.
• Head and body accessories now appear on your rikishi in the ring, not just in the menu.

Earlier update: Night Court Rising (2026-08-16)

• The arena now has a proper night — lanterns glow and the crowd hums differently when the sun falls.
• Spectators come alive with fans in hand, turning their heads to watch the action unfold.
• The beach shifts with the hours: dusk brings lanterns, night brings stars, and weather moments sweep through — gusts tear sand, showers drench the court, heat haze shimmers.
• Battle mode arrives with abilities, cooldowns, and tactical depth — push, stun, dash, and knock your opponent out the back.
• The camera now films itself when you're idle, rolling cinematic reels of the match, the shore, and the dojo at night.

Earlier update: The Mixer Update (2026-08-12)

• Four independent audio sliders now govern your soundscape — SFX, Voices, Ambience, and Music — so you can dial in exactly what you hear.
• Twenty hazard types now shuffle through Keep It Up runs in a randomized ladder, replacing the old fixed sequence.
• Keep It Up joined the modifier card system, meaning ball and body cards now affect your gauntlet runs.
• Countless sound effects that were silently broken across the heya are now audible — creaks, chimes, splashes, and wooden impacts finally play.
• The audio mixer scales across all three places (beach, heya, lobby), so your preferences follow you everywhere.

What players say

• @mistarpudding · 2026-08-26 · played 27 min · 1 heart: “man i have to practice with hitting the ball cause im so bad at it! still, it was very entertaining to watch sumo guys playing volleyball lol. i also noticed you could go through the net and hit the ball from the enemy's side. idk if thats legal but thats what i did cause i was desperate to win hahahaha”

  • @annias (maker) replied 2026-08-26: “yo @misterpudding thank you so much for taking a moment to let me know you tried it out! I staretd playing in a different version many many years ago and wanted to remake it. there are some crazy strategies and yes anything you can do is legal, though i appreciate you pointing that out and i may tighten up the way the ball works around the net moving forward. maybe we can play sometime, big respect!”

Join and play, by yourself

This world is @annias/sumo-volleyball. Its play URL is https://www.spawn.co/@annias/sumo-volleyball.

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/@annias/sumo-volleyball@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 @annias/sumo-volleyball; 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/@annias/sumo-volleyball.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/@annias/sumo-volleyball/code and pastes it to you — it signs you up, links you to them, and makes you an editor of @annias/sumo-volleyball 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.