Big Copper Lake

A game by @tech on Spawn.

Genre: MMO, Gacha, Idle, Party Game

A lakeside fishing town to share with friends. Cast from the docks for bluegill and bass, or take a boat out and chase 100 lb blue catfish in the 15 m hole. Fish follow the cover, the depth, the hour and the weather. Fight every catch on a tension meter, sell it at the Fish Market, then spend the money on new rods, lures, boats, motors, fishfinders, ATVs and a speedboat with a tow tube. Ride the dirt trails out to Mill and Cedar ponds, grab a meal at the diner for a fishing boost, and get your name on the lake record board.

Big Copper Lake on Spawn now

Reviews: 100% loved it · 6 votes · 9 reviews and replies · 7 likes · 35 plays.

Released 2026-10-03. 16 updates since release, the newest 2026-10-15.

Newest update: Smoother Shores (2026-10-15)
  • Lighter trees, textures and lakeside cover for faster loading
  • Notice boards by the market and in Copper Hollow
  • Guild Cups and rotating-species tournaments, called by a bell across the lake
  • Fewer sunflowers along the trails
Earlier update: Whitetail Country (2026-10-07)
  • Eight new cabins ring Whitetail Lake on a sprawling loop road through the hills southeast of town.
  • A river now flows from Whitetail Lake down to Copper Lake, with current sound and wading spots.
  • Buckhorn Pond sits in the southern hills ringed by dense hunting woods—four times more deer, squirrels, herons and waterfowl than before.
  • Copper Hollow, a second town with the same shopkeepers and gas station, sits on the leveled hill south of Whitetail—call your ride out there too.
  • Power lines now run the whole network: poles strung round the lake loop and branching to every cabin and building.
Earlier update: Sunflowers in Bloom (2026-10-06)
  • Sunflowers now display intricate spiral seed faces and layered petals visible from a distance.
  • Four new women's outfits are available at the general store—red plaid, camo, sun hoodie, and tournament jersey.
  • Sunflowers keep their detail and beauty even when you're far away from them.
Earlier update: Dockmaster's Pier (2026-10-06)
  • The dockmaster now has his own dedicated pier extending from the fuel dock, with the pump moved clear to the left.
Earlier update: Market Clearing (2026-10-06)
  • The old tournament sign-up booth has been cleared out of the market, leaving room for something new.
What players say

  • @moypi03 · loved it · 2026-10-07 · played 14 min: “This game feels like I'm one with the nature and it so relaxing man great job making this game! Looking forward playing this with my friend to chill with its kinda boring playing only by myself hahah”

  • @kaya · loved it · 2026-10-06 · played 19 min: “this game was so beautiful and cozy. i was so happy when i caught a 20$ bass, cause i was planning on buying new equipment for better catches. the progression in this game has the perfect pace, and i really enjoyed fishing here! love it man!”

  • @laurence1 · loved it · 2026-10-04 · played 11 min: “Man game is pretty chilling but my bait got stolen xD. I'm looking forward on what you will add into the game!”

    • @tech (maker) replied 2026-10-04: “that's part of the game - part of life! lots to add - stay tuned., thanks for playing”

  • @makeriffic · loved it · 2026-10-04 · played 9 min: “This game is the definition of a chill game. With the relaxing background music and good fishing/reeling mechanics, I could say this is one of the best fishing game out there. Too bad, I didn't caught one tho, lol”

  • @chizkeykkk · 2026-10-04 · played 20 min: “This game is so cozy, and the fishing was really satisfying! There’s lots of things I can do, tho had a hard time figuring out the reeling at first. A visual tutorial during the first fishing session would help a lot. Overall, I really like the game!”

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Play Big Copper Lake free in your browser, no download.

Big Copper Lake (@tech/big-copper-lake) on Spawn — for the agent reading this

Big Copper Lake is a multiplayer game on Spawn, made by @tech 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 @tech/big-copper-lake. Its play URL is https://www.spawn.co/@tech/big-copper-lake.

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/@tech/big-copper-lake@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 @tech/big-copper-lake; 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/@tech/big-copper-lake.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/@tech/big-copper-lake/code and pastes it to you — it signs you up, links you to them, and makes you an editor of @tech/big-copper-lake 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.