Sumo Summit
A game by @0xkepler on Spawn.
Genre: Arena Brawler
2–8 online wrestlers. Create a summit room, welcome your rivals, and push them into the clouds.
Sumo Summit on Spawn now
Reviews: 100% loved it · 1 vote · 6 reviews and replies · 2 likes · 33 plays.
Released 2026-09-16. 1 update since release, the newest 2026-10-10.
Newest update: The Dojo Opens (2026-10-10)
- Train against up to 7 AI opponents in the Dojo, a private practice arena separate from online matches.
- Master three new sumo techniques — Shiko, Tegatana, and Sumo — each with their own timing and power.
- Face off one human versus one or more bots in an ephemeral Dojo that resets between sessions.
- Customize your wrestler's appearance before entering the ring with the new character editor.
What players say
@jissi · 2026-09-17 · played 2 min · 1 heart: “Ayo we have the same game name wut 😆 But completely different play styles. Good take on sumo fam :)”
- @0xkepler (maker) replied 2026-09-17: “haha yeah i saw. savi came up with the name for me so maybe that's why”
@larrielabs · 2026-09-16 · played 10 min · 1 heart: “This game is so fun! 😂 I love the victory animation, it makes winning feel even more satisfying! 🏆✨ I also really appreciate having the manual there for the controls, especially when you’re still figuring out how everything works. Played this with my friend and I enjoyed every part of it! 🥹🎮💕”
- @0xkepler (maker) replied 2026-09-16: “thanks for enjoying the details such as the winning animation”
@sunraku · 2026-09-16 · played 16 min · 1 heart: “Tried this one on multiplayer and It was fun to play. The mechanic is simple and it was easy to use the controls. I like also that it was set to top-down slightly iso view.”
@chizkeykkk · loved it · 2026-10-10 · played 14 min: “Playing with 7 bots is straight-up torture haha 😂 I like the game, but it was so hard to keep track of which one was my character 😅”
- @0xkepler (maker) replied 2026-10-10: “i wanted it to feel chaotic, maybe i went a bit overboard haha. thanks for playing!”
@alongzera · 2026-09-22 · played 13 min: “fun addicting game! its just annoying when i get slapped on and out of the circle lmao! fun game though!”
Play Sumo Summit free in your browser, no download.
Sumo Summit (@0xkepler/sumo-summit) on Spawn — for the agent reading this
Sumo Summit is a multiplayer game on Spawn, made by @0xkepler 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 @0xkepler/sumo-summit. Its play URL is https://www.spawn.co/@0xkepler/sumo-summit.
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/@0xkepler/sumo-summit@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 @0xkepler/sumo-summit; 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/@0xkepler/sumo-summit.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/@0xkepler/sumo-summit/code and pastes it to you — it signs you up, links you to them, and makes you an editor of @0xkepler/sumo-summit 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.