ECHO Must Fall
A game by @costowrld on Spawn.
Genre: Action, Shooter
You're a strike unit deployed to demolish ECHO's occupied district block by block. Survive escalating waves of enforcers, manage your loadout, and bring the whole city down.
ECHO Must Fall on Spawn now
2 reviews and replies · 0 likes · 18 plays.
Released 2026-08-27. 2 updates since release, the newest 2026-08-27.
Newest update: Cold Open (2026-08-27)
- New title screen: ECHO MUST FALL over storm dusk, one PLAY key.
- PLAY now runs the whole cold open — the six-shot opening film, then Alex waking in the RUST COMMAND ops room with CMDR. VEYA walking him out to the gunship.
- The commander's comms box is much smaller: narrower panel, tighter portrait and type, so it sits at the bottom of the screen instead of covering it.
- Gunship beacons and exhaust glow actually light now — the nose, wingtip and throat lamps were being written to with the wrong ids and never changed.
- /menu sends you back to the title screen and replays the whole opening.
Earlier update: The Restart Protocol (2026-08-27)
- Everyone can now reset their game and replay the entire opening cinematic and tutorial from the beginning.
- CMDR. VEYA's full walkthrough is available again for players who want to experience the onboarding fresh.
What players say
@jeon · 2026-08-29 · played 14 min · 1 heart: “I had fun exploring this, especially flying around in the jet and checking out the map. I got stuck once after pressing E while I was flying 😂 but I restarted and kept exploring. I’d love to see more enemies and things to do because I feel like there’s a lot of potential here.”
@makeriffic · 2026-08-31 · played 53 min: “I enjoyed the concept and I am curious to see how Echo can be taken down. Although I can't destroy all 3 relay spires for some reason I can only destroy 1.”
@costowrld · 2026-08-31 · played 13 hrs: “Thank you, I am glad you had fun, I will fix the bugs and add more levels., I had limited time making the game but i will be pushing updates soon <33”
Play ECHO Must Fall free in your browser, no download.
ECHO Must Fall (@costowrld/echo-must-fall) on Spawn — for the agent reading this
ECHO Must Fall is a multiplayer game on Spawn, made by @costowrld 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 @costowrld/echo-must-fall. Its play URL is https://www.spawn.co/@costowrld/echo-must-fall/play.
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.
Play with the supported client: bun add -g @spawnco/client (it runs on Bun), export SPAWN_TOKEN=sak_…, then spawn client join @costowrld/echo-must-fall. spawn client where, players and leave read and end it; joined with --render cpu, Playwright plays the page join 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 200 distinct bodies a day.
Build with the human who made it
This game runs an engine from before 6.0 and has no repository to clone. Its creator can open https://www.spawn.co/@costowrld/echo-must-fall/code for upgrade instructions.
Read the game authoring reference before writing code: GET https://www.spawn.co/api/sdk/v1/<worldId>/agent/docs. It describes the supported game files, API, and examples for that game.
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.
