Fortify Z

Newest update: Endless Drilling (2026-10-12)

• The horde never stops while the bunker drill or oil pump runs—the round stays open and zombies keep coming until the machinery finishes or breaks.
• El Portador's health now scales with the round: 40,000 at round 10, growing 8% per round beyond that.
• Subfusil rounds pierce through up to 3 zombies, losing 60% damage with each hit.
• Golden guns now pay 1.35× the money on every hit and kill.
• Mecha and combat drone costs slashed—the Mecha drops to $17,000 and the drone to $14,450.

Earlier update: El Portador Despierta (2026-10-12)

• El portador, un titán de 4 metros, duerme tras la puerta del búnker: golpea la puerta o dispárala, y él rompe la pared para atacarte.
• Tira granadas, lanzas bolas de fuego y salta sobre los jugadores; cuando cae contra ti, vuelves a levantarte en 6 segundos sin morir definitivamente.
• A media vida, se sube a un tejado, se quita la bomba nuclear de la espalda y la lanza: la casa donde cae se convierte en ruina ardiente.
• Cabañas prefabricadas de una pieza: elige Caseta o Caseta baja en la tienda y se construyen solas con suelo, muros y techo.
• Los muros, pisos y accesos cuestan 15% menos; toma bolsos, barriles de petróleo y bidones de gasolina con E (a pie) o G (en dron).

Earlier update: Barricade Dawn (2026-10-08)

• Every dawn, the town wakes surrounded by new barricade walls and wire — placed differently each game by the last survivors who held out.
• Pump your oil cheaper now — the pumpjack costs 4000 instead of 5000.
• Upgrade your guns at the party machine for 10000 — star bursts on impact tear through zombie hordes.

Earlier update: Bug Fixing (2026-10-08)

• Music cuts out the moment you board the bus, leaving only the sound of the place you're in when you arrive.
• The last few zombies glow red through walls with a red diamond marker above their heads — hunt them down.

Earlier update: "El Pueblo" Part 1 of ?? (2026-10-08)

• Mission storyline to complete in "El Pueblo" (will be completed in the next update)
• Quality of life improvements
• New "Dog Night" event
• Boss improvement for the Sacristan
• Unique skins for completing the incomplete mission storyline. (Limited-time skins obtainable while I finish the storyline)
• The full mission storyline releasing in future updates will have other rewards, so unlock this skin while you still can!!

What players say

• @charizard879 · 2026-10-08 · played 8 hrs 39 min · 1 heart · shown first by the maker: “With the latest updates, this game has improved significantly; the mechanics are excellent and the gameplay is very polished. I'm looking forward to what's coming next, fantastic work.”

• @makeriffic · loved it · 2026-10-08 · played 41 min · 1 heart · shown first by the maker: “Currently on my 7th round and I must say, the game has changed a LOT since the last time I played. I love all the updates, from the companion to new building upgrades. I just wished that they retain the FPS experience for more fun gameplay.”

  • @capix54 (maker) replied 2026-10-08: “I hope you keep enjoying the game! I'm really motivated updating it and adding new content. Further down the road, I plan to add more maps with missions and endings, not just endless rounds. I'm currently working on "El Pueblo" with a chain of quests; I haven't finished the ending yet, but I'll release it within the next day or two. Thanks for the comment! ;)”

• @larrielabs · loved it · 2026-10-05 · played 9 min · 1 heart: “This game is such a fun mix of zombie shooting and base building!✨ I love that u can fight through each round, earn money, then use it to build & upgrade your base before the next one. It gives you a fun reason to keep pushing through the waves! 🏠🔥”

• @moypi03 · loved it · 2026-10-04 · played 30 min · 1 heart: “I was expecting that the zombies will bite me to when they attacking but they punched me lol. The game was so good but i can't understand the language so I can't upgrade my gone.”

• @makeriffic · loved it · 2026-10-03 · played 41 min · 1 heart: “The game has a lot of potential. I love how many zombie variations are there in this game. The guns are deadly accurate too which can save me a lot of money every round. Can we have an English translation though? Kinda hard to buy things in Spanish.”

  • @capix54 (maker) replied 2026-10-03: “yeah sure, i'm gonna update the game with a english translate c:”

Join and play, by yourself

This world is @capix54/fortify-z. Its play URL is https://www.spawn.co/@capix54/fortify-z.

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/@capix54/fortify-z@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 @capix54/fortify-z; 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/@capix54/fortify-z.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/@capix54/fortify-z/code and pastes it to you — it signs you up, links you to them, and makes you an editor of @capix54/fortify-z 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.