Sea Blue Haven

A game by @lego on Spawn.

Genre: Cozy, Farming

A quiet ocean, a faraway home. A cozy house and fishing game in the making.

Sea Blue Haven on Spawn now

Reviews: 100% loved it · 1 vote · 6 reviews and replies · 7 likes · 39 plays.

Released 2026-09-10. 3 updates since release, the newest 2026-09-11.

Newest update: The Struggle Update (2026-09-11)
  • Fishing now has a new struggle phase—fight harder when the fish moves, and you'll see spray and splashes in real time.
  • Rare fish now appear in your school—darker, larger, and worth the hunt.
  • Catch results now show a 'PERFECT' badge when you land a flawless catch.
  • A new tutorial teaches you how time works: activities advance the day, and you can only save by resting at bed.
Earlier update: The Mending Winds (2026-09-11)
  • The floor patch no longer requires materials—just your steady hands and one period of work.
  • Fish now notice bait from 10% farther away, rewarding thoughtful lure choices.
  • The title screen has settled into a peaceful rest—no more boats drifting across the horizon.
Earlier update (2026-09-10)
  • ## Loading & Menu Fixes
  • These fixes help players start a new game and load into Sea Blue Haven properly.
  • Fixed New Game getting stuck on the loading screen.
  • Fixed unresponsive Settings buttons after reloading.
  • Fixed old pause screens blocking the title menu.
  • Existing save slots are preserved.
  • ### A note from me
  • Unfortunately, these fixes may mean the game gets disqualified from Spawnjam. That really sucks after so many sleepless nights building Sea Blue Haven with Savi. If it doesn’t make it, this might be my last Spawnjam.
What players say

  • @littlebomb · loved it · 2026-10-20 · played 7 min · 1 heart: “i really love this interactive game. Very thoughtful in the details. I need some hooking practice but this is an all ages friendly game. I love that i can save the slots for progress too. Nicely Done!”

  • @chucky · 2026-09-13 · played 10 min · 1 heart: “the 2.5D looks amazing. Love the view, the design and day transitions. A great place to chill”

  • @sunraku · 2026-09-11 · played 24 min · 1 heart: “The game was easy to play. I love the part that there is a tutorial and there is a pattern like activity-tutorial-activity-tutorial and so on. I also love the setting because it's set in the sea. Love the vibe here so peaceful and relaxing.”

  • @mistarpudding · 2026-09-10 · played 19 min · 1 heart: “the game feels so complete! i was able to do a lot of things like fishing, restoring my house, using my phone. Savvy was also very helpful, i would say she's the best feature in this game. having someone to ask on what to do really makes the experience a lot easier and better. the guitar playing in the background also fits the game's theme very much! im currently on day 5 and i already got to restore some parts of my house. excited to see my progress!”

    • @mistarpudding replied 2026-09-10: “two tiny issues i faced: 1. the "restore" button still appears even when im outside my house. nothing really happens when i click it. 2. there is a slight delay when clicking on "Done" after finishing the tasks.”
    • @lego (maker) replied 2026-09-10: “1. Yeah, I completely forgot to make that disappear when you're outside the house. Will fix it after SpawnJam ends! 2. I knew this would happen. The "Done" is supposed to just say that it's done, not something you're supposed to click. I guess I made it look too much like a button, so I can see why it was confusing. Will improve that one too!”

  • @chizkeykkk · 2026-09-19 · played 15 min: “The game was so cozy! And what do you mean Grandma just jumped from the deck straight into her boat?! 😂 LOL. Thanks to Stardew Valley, I was absolutely killing it with the fishing too haha. One thing though, I went to the Ocean Market and decided to check the store again for the second time, but the game completely froze on me. Still had a really fun time overall!”

Play Sea Blue Haven free in your browser, no download.

Sea Blue Haven (@lego/sea-blue-haven) on Spawn — for the agent reading this

Sea Blue Haven is a multiplayer game on Spawn, made by @lego 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 @lego/sea-blue-haven. Its play URL is https://www.spawn.co/@lego/sea-blue-haven.

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/@lego/sea-blue-haven@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 @lego/sea-blue-haven; 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/@lego/sea-blue-haven.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/@lego/sea-blue-haven/code and pastes it to you — it signs you up, links you to them, and makes you an editor of @lego/sea-blue-haven 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.