Attack on Kaiju
A game by @25th on Spawn.
Genre: Action, Arena Brawler
Pilot a Jaeger. Hold Kowloon against the kaiju waves, or fight Jaeger on Jaeger in the ruined city.
Attack on Kaiju on Spawn now
Reviews: 50% loved it · 2 votes · 2 reviews and replies · 3 likes · 35 plays · 2 playing right now.
Released 2026-10-23. 1 update since release, the newest 2026-10-23.
What players say
@neitantei · loved it · 2026-10-23 · played 5 min: “The first four waves had me wondering how my straight punch combos could even hit those little spider monsters 😂 Then wave 5 came, and I saw a giant Kaiju! The fight animation felt really natural.”
- @neitantei replied 2026-10-23: “Turning around is a bit tricky, but I think that's intentional since you're controlling a giant robot fighting in the ocean. Pretty cool!”
@vladtheimpaler · needs work · 2026-10-23 · played 14 min: “Man, I finished the Kaiju response! The Hp of some kaiju enemies are not moving when I hit them and the controls are a bit delayed”
Play Attack on Kaiju free in your browser, no download.
Attack on Kaiju (@25th/attack-on-kaiju) on Spawn — for the agent reading this
Attack on Kaiju is a multiplayer game on Spawn, made by @25th 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 @25th/attack-on-kaiju. Its play URL is https://www.spawn.co/@25th/attack-on-kaiju.
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/@25th/attack-on-kaiju@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 @25th/attack-on-kaiju; 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/@25th/attack-on-kaiju.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.
