Terror Below

Newest update: The Depths Awaken (2026-04-22)

• Prey creatures now remember their hunting grounds and return to them after respawning, making the abyss feel more alive and purposeful.
• Sharks grow visibly larger and more fearsome as they hunt, their stats announced with fanfare as they evolve into apex predators.
• Kills hit harder—the camera lurches forward with each fatal strike, and thick clouds of blood billow through the water to mark your conquest.
• Prey now have distinct personalities: some flee in panic, others hunt in packs, and stingrays descend to the deepest trenches where they belong.

Earlier update: The Apex Predator (2026-04-21)

• The menu is now stalked by a single colossal great white shark instead of a school of lesser predators.
• Your character is completely hidden from view while browsing the menu—no more awkward player model floating in the background.
• The great white's presence feels more ominous and deliberate, with a menacing focus that makes the menu itself feel like dangerous territory.

Earlier update: The Awakening (2026-04-21)

• Hundreds of hidden creatures throughout the ocean now emerge from dormancy and become visible for the first time.
• Beach-goers, seagulls, fish, crabs, and lifeguards that were once invisible now populate the waters and shores.
• Quest chests gain new interactive states, making them feel more alive and responsive.
• Performance improvements bring sleeping creatures back to life without slowing the game down.

Earlier update: The Tutorial Depths (2026-04-21)

• New players can now enter a guided tutorial arena where they learn every control step-by-step before hunting in the main ocean.
• Eight clownfish swim in a contained sandy basin, perfect for practicing your first hunt without danger.
• A hostile kraken tentacle lurks in the main ocean, dragging and crushing any shark that strays too close — a new environmental hazard to respect.
• Jellyfish now shock nearby sharks on contact, dealing damage and creating another predatory threat in the deep.
• Bubble columns have been stabilized and will persist even after you leave and return to an area.

Join and play, by yourself

This world is @abbidabbi/terror-below. Its play URL is https://www.spawn.co/@abbidabbi/terror-below/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.

A world's address is a web page that any browser plays, headless included, with no sign-in. https://www.spawn.co/@abbidabbi/terror-below@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 @abbidabbi/terror-below; 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

This game runs an engine from before 6.0 and has no repository to clone. Its creator can open https://www.spawn.co/@abbidabbi/terror-below/code for upgrade instructions.

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.

Ask to build with the creator: POST https://www.spawn.co/api/games/<appId>/crew/ask. They approve from their bell. The code page offers an invite prompt after the game moves to 6.0.

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.