MONDO COSMICO

A game by @pixelmc on Spawn.

Genre: Adventure, RPG

Un omaggio a Undertale in bianco e nero: risparmia o combatti i mostri delle rovine.

MONDO COSMICO on Spawn now

Reviews: 60% loved it · 5 votes · 5 reviews and replies · 3 likes · 13 plays.

Released 2026-10-27. 20 updates since release, the newest 2026-10-29.

Earlier update: 11 Finali (2026-10-29)
  • 11 finali invece di 3: cosmico, cacciatore, fantasma, zucca, rana, stellare, d'oro e altri
  • Ogni finale ha le sue parole della capra e un epilogo
  • Nuova lista FINALI SCOPERTI con indizi per quelli che mancano
  • Più testi in inglese: mostri, trofei, workshop, THE CRYSTAL GROTTO, NOODLE
  • Correzioni a battaglie, muri dei mostri e workshop con le creazioni degli altri
Earlier update: Rovine piene di vita (2026-10-28)
  • Quasi 300 decorazioni nuove in tutte le stanze: erba, candele accese, cristalli e funghi colorati, colonne rotte e lampioni. La bancarella di MR PINGU ora è tutta a colori. Nel server privato arriva il CAPO della squadra, che può condividere ADMIN, WORKSHOP e MOD. Pixelblox si può sfidare di nuovo in una rivincita. Arrivano anche la GUIDA con i tutorial, la ricerca in WORKSHOP e TROFEI, i livelli FUNKY creati da te e i pezzi per costruire la lobby.
Earlier update: MOD nel privato (2026-10-28)
  • Il pannello MOD con tantissime opzioni (taglia, colore, titolo, anima, mostri d'oro, parlate buffe, filtri, zoom, musica, coriandoli) ora vive solo nel server PRIVATO. Nel pubblico ogni mod si toglie.
Earlier update: MOD e Mostri Colorati (2026-10-28)
  • Nuovo bottone MOD: taglia, colore, titolo sopra la testa, colore dell'anima, mostri d'oro o arcobaleno, parlate buffe, filtri, zoom, musica e coriandoli. Solo per te, e un tasto le toglie tutte. In più 22 mostri colorati nelle rovine: rossi, blu, viola, d'ombra e d'oro, più forti e con più oro. Targhette con nome, LV e stelle sopra ogni giocatore.
Earlier update: ADMIN nel Server Privato (2026-10-28)
  • Chi apre un server PRIVATO ha il bottone ADMIN: cura, velocità, teletrasporto nelle sale, porta qui il party, calma o sveglia i mostri, apri il muro segreto. Tornando nel pubblico skin e cappello del workshop, velocità e vita curata dall'admin si azzerano. Su telefono il contatore stelle e i suggerimenti non coprono più i bottoni.
What players say

  • @vladtheimpaler · loved it · 2026-10-28 · played 3 min · 1 heart: “Hey bro, I keep seeing the neutral ending hahaha I must've missed something on the map but love seeing a game like this bro, it's nostalgic”

    • @pixelmc (maker) replied 2026-10-29: “well if u want to happen another ending you could ask me what ending you want”

  • @andreamgdev · loved it · 2026-10-28 · played 44 min · 1 heart: “Bello”

  • @lego · needs work · 2026-10-27 · played 4 min · 1 heart: “Undertale fan here! Wanna try this out, but I need an English option”

    • @pixelmc (maker) replied 2026-10-29: “i got an option now”

  • @kaya · needs work · 2026-10-27 · played 9 min · 1 heart: “i keep getting the neutral ending so i might be missing something with the monsters or the signs. loved how this took me back to playing Undertale though, but I wish there was an English translation so I could understand what the signs were saying”

    • @pixelmc (maker) replied 2026-10-29: “ok i add an option to it try it and i put more things try now”

  • @andreamg2tablet · loved it · 2026-10-28 · played 8 min: “Good cool”

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Play MONDO COSMICO free in your browser, no download.

MONDO COSMICO (@pixelmc/mondo-cosmico) on Spawn — for the agent reading this

MONDO COSMICO is a multiplayer game on Spawn, made by @pixelmc 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 @pixelmc/mondo-cosmico. Its play URL is https://www.spawn.co/@pixelmc/mondo-cosmico.

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/@pixelmc/mondo-cosmico@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 @pixelmc/mondo-cosmico; 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/@pixelmc/mondo-cosmico.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/@pixelmc/mondo-cosmico/code and pastes it to you — it signs you up, links you to them, and makes you an editor of @pixelmc/mondo-cosmico 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.