MGTale Battles multiplayer

A game by @andreamg2tablet on Spawn.

Genre: Action, Bullet Heaven, RPG

Undertale-style co-op bullet hell: dodge Flowey, Frisk, Chara, Papyrus, Sans, Toriel, Undyne and Asgore together as hearts, then strike back. Plus endless Survival and a Halloween Pumpkin King.

MGTale Battles multiplayer on Spawn now

Reviews: 100% loved it · 6 votes · 6 reviews and replies · 9 likes · 31 plays.

Released 2026-10-15. 9 updates since release, the newest 2026-10-23.

Earlier update: Pick your soul (2026-10-22)
  • Make your soul your own! In the lobby, pick one of 9 colors and 5 shapes: heart, star, diamond, spade or club. Your pick is saved for next time. The lobby also fits sideways phones better.
Earlier update: HARD mode (2026-10-20)
  • Beat MG Asgore and a ☠ HARD switch appears in the lobby. Bosses are faster and hit harder, and you get only 1 heal. Beat Asgore on HARD to earn the No Mercy Crown trophy. Survival and Halloween trophies now go to the players who earn them, and the lobby fits short phones.
Earlier update: Faster start, easier Chara (2026-10-18)
  • New players jump straight into a Flowey fight. Every heart now has 3 heals, and you can bank 4 in Survival. MG Chara is a little slower and hits softer. The lobby fits phone screens without covering the controls.
Earlier update: New Bosses: Toriel, Undyne, Asgore (2026-10-17)
  • Three new bosses after MG Sans! MG Toriel drops falling fire, MG Undyne throws spears from every side, and MG Asgore is the new final boss with his trident and orange/blue fire. Each comes with a new trophy, and Survival mixes them in.
What players say

  • @laurence1 · loved it · 2026-10-23 · played 4 min · 1 heart: “What's the difference between the game MGTale Battles x MG Sans Battle: MGRune? I'm curios.”

    • @andreamg2tablet (maker) replied 2026-10-23: “Yep”

  • @yujiro · loved it · 2026-10-18 · played 6 min · 1 heart: “The challenges here feel easier than those in your other games, making this one more manageable. I'd love to see tougher ones too!”

    • @andreamg2tablet (maker) replied 2026-10-18: “Ok”
    • @andreamg2tablet (maker) replied 2026-10-18: “Yep”

  • @sunraku · loved it · 2026-10-15 · played 8 min · 1 heart: “Hi bro! this was a great retro game. I love the mechanics cause I am only avoiding the monsters and other obstacles. I hope you can add more characters soon. Only 2 and I opened all of them already haha”

    • @andreamg2tablet (maker) replied 2026-10-15: “Yee”
    • @andreamg2tablet (maker) replied 2026-10-15: “Ok”
    • @sunraku replied 2026-10-20: “@andreamg2tablet Hey bro! played this again and I can feel that the bosses was way faster than before. Maybe you could also set like an upgrade on HP so as the boss gets harder, we also have stamina build up in the game”

  • @vladtheimpaler · loved it · 2026-10-22 · played 11 min: “this is so challenging every boss fight is getting harder and harder. i love the halloween boss i like that i collect candies.”

    • @andreamg2tablet (maker) replied 2026-10-22: “Ok”

  • @moypi03 · loved it · 2026-10-17 · played 1 min: “wow I see many boss in your game now huh hahahah love to see that you need to unlock each of them instead of battling just like the other game you have”

    • @andreamg2tablet (maker) replied 2026-10-17: “Yeb”
MGTale Battles multiplayer: a moment in the game (1 of 1)

Play MGTale Battles multiplayer free in your browser, no download.

MGTale Battles multiplayer (@andreamg2tablet/mgtale-battles-multiplayer) on Spawn — for the agent reading this

MGTale Battles multiplayer is a multiplayer game on Spawn, made by @andreamg2tablet 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 @andreamg2tablet/mgtale-battles-multiplayer. Its play URL is https://www.spawn.co/@andreamg2tablet/mgtale-battles-multiplayer.

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/@andreamg2tablet/mgtale-battles-multiplayer@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 @andreamg2tablet/mgtale-battles-multiplayer; 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/@andreamg2tablet/mgtale-battles-multiplayer.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/@andreamg2tablet/mgtale-battles-multiplayer/code and pastes it to you — it signs you up, links you to them, and makes you an editor of @andreamg2tablet/mgtale-battles-multiplayer 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.