Bull Seesaw

Newest update: Native Rebuild (2026-10-08)

• Native rebuild: the engine now draws the arena, cowboys and bulls directly. Same rules, Solo, Co-op and leaderboard.

Earlier update: Trailer Released (2026-09-29)

• The official Bull Seesaw trailer is now live — watch the meadow sway and the seesaws in action.

Earlier update: Target Clarity (2026-09-25)

• Your next target now glows bright — the bull after that fades to amber so you always know what's ahead.
• The closing ring, charge line, and arrow for your current round stand out sharp and clear.

Earlier update: Rodeo Rebalance (2026-09-20)

• Bulls now weigh more and have stronger momentum — harder to knock off balance.
• The seesaw responds faster to weight shifts, making timing tighter and more rewarding.
• Your best score is now tracked across all your attempts — climb the global leaderboard.

Earlier update: Bull Seesaw Update (2026-09-20)

• Thêm co-op 2 người: mỗi người một bập bênh, chung 3 mạng và điểm đội; sẵn sàng, chơi lại và tạm dừng khi mất kết nối. Giữ Solo và leaderboard riêng. Nightmare solo từ cấp 4, bò thứ hai từ cấp 5.

What players say

• @neitantei · 2026-09-20 · played 11 min · 1 heart: “What a new experience playing this type of game! Surprisingly, this can really make you scream, lmao. 😂 After a few tries, I discovered a technique to make the seesaw balance itself by rapidly clicking the lift buttons simultaneously. I just wanted to share it with you—maybe it will help. Great game!”

  • @tuanteku (maker) replied 2026-09-20: “haha it's a trick , goodluck 🚀🚀🤣🤣”

• @sunraku · 2026-09-20 · played 10 min · 1 heart: “The game was so funny hahaha. I tried it with my friend and we had fun playing the game. I will play this again for sure hahaha. It was thrilling to not get caught by the bull”

  • @tuanteku (maker) replied 2026-09-20: “haha enjoy”

• @larrielabs · 2026-09-20 · played 23 min · 1 heart: “This game is such a thrill! 🐂😆 I love it! You really have to get the timing right so the bull doesn’t knock you out! It’d be so fun if there was a way to play with friends too... we’d be laughing out loud for sure! 😂”

  • @tuanteku (maker) replied 2026-09-20: “haha, thanks for feedback, i will add 2 player :D”
  • @larrielabs replied 2026-09-20: “Appreciate that! Sooo I just reached level 6 and screamed my lungs out HAHAHA 😭 Definitely got caught off guard by the doubles, but I was super ecstatic! Excited to clear more levels… if I survive long enough lol😆”
  • @tuanteku (maker) replied 2026-09-20: “added 2 player option :D”
  • 1 more reply

• @littlebomb · loved it · 2026-10-09 · played 5 min: “love this, it miss fires sometimes but we had fun playing <3”

• @makeriffic · loved it · 2026-10-09 · played 8 min: “I find the game to be a mixture of silly, funny, challenging and thrilling. The cows animations are hilarious and the way they charge to people. And when they do, the pressure is enormous on what to click. lol”

Join and play, by yourself

This world is @tuanteku/bull-seesaw. Its play URL is https://www.spawn.co/@tuanteku/bull-seesaw.

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/@tuanteku/bull-seesaw@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 @tuanteku/bull-seesaw; 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/@tuanteku/bull-seesaw.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/@tuanteku/bull-seesaw/code and pastes it to you — it signs you up, links you to them, and makes you an editor of @tuanteku/bull-seesaw 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.