Salmon Survival with weapons that are fun, and co-op for up to four friends. The same river, the same life -- hatch in the gravel of the source, grow up in the brook, go down to the sea with the smolts, come home to spawn -- the same graphics (it is built on Salmon Survival Next and keeps taking its updates), only now everything that is not a salmon comes for you, and you have something to answer with: a little pew-pew laser for the fry, bigger guns with every stage, torpedoes, a katana on your back, and whatever else is fun, found along the way and behind stones. Work in progress: the combat and the co-op are being built.

Play it in the browser: https://salmon-survival-extreme.vercel.app

The calm original: Salmon Survival.

Live one salmon's whole life in a Nordic river. Hatch in the gravel of the source, grow up in the brook, go down to the sea with the smolts, and fight your way home to spawn where you were born. On the way: storms and flash floods, an angler's fly, otters, gill nets, a fish ladder, sea lice at the salmon farm, the northern lights.

Play it in the browser: https://salmon-survival.vercel.app — in English, Deutsch, 中文, 日本語 and Български. It needs a computer with a keyboard and a mouse, and it saves as you play.

Written with Claude Opus 5.5.

• Mouse: steer (click the view first)
• W swim · S brake and hold on to the bottom
• A / D dodge sideways
• Space dash, bite, leap (at the surface: over a waterfall)
• M map · L logbook · I stories and facts · T sound · P pause (the buttons on the right show while paused)

Found a bug, have an idea, want to add a fish, a plant or a translation? Open an issue or a pull request. See CONTRIBUTING.md.

It is a static site with no build step. Serve this folder with any static web server and open it:

python3 -m http.server 8000
# then open http://localhost:8000

Useful for trying things: ?new&stage=parr&at=4500 starts a new parr at a place along the river (at is the distance from the source in tenths of a metre), ?event=storm|angler|otters|floes|aurora starts one of the events at once, ?lang=en|de|zh|ja|bg picks the language.

• index.html, style.css – the page, the HUD, the start card
• src/main.js – the game loop: the fish, the camera, what happens
• src/course.js – the river from source to sea: its bed, its level, its current
• src/terrain.js, src/features.js – the ground, the plants, and the special places (caves, the mill, the bridge, the wreck …)
• src/forest.js – the forest on the banks: spruce, pine, birch, juniper, bilberry, ferns (needles and leaves cut out of cards in the shader, with the seasons)
• src/salmon.js – the salmon: stages of life, growth, swimming, leaping
• src/life.js, src/predators.js, src/rivals.js, src/school.js, src/brawl.js – food, shoals, hunters, fights
• src/events.js – storms, anglers, otters, ice floes, northern lights
• src/eddies*.js, src/flowfield.js – the water flowing round stones
• src/i18n*.js – the translations (the game is written in German; English, Chinese, Japanese and Bulgarian are laid over it)
• src/render/ – how it is drawn, in three.js's node shading language (TSL), on WebGPU where the browser has it and WebGL 2 where not: the water's light (water.js: caustic net, canopy shade, absorption, for every lit material), the caustic pass, the underwater fog, the soft shadows, the plants' material, the fish's swimming, instancing for shapes that bend before they are placed, and the passes after the scene (post.js: light shafts, the mirror under the surface, bloom, the temporal resolve, the grade)
• src/materials.js – the bed, the rocks, the water's surface from below and above, the falls, the sky, point clouds
• shared/, ui/ – small helpers from Desktop Habitats, which the rendering first grew out of; vendor/ – three.js r186 (three.webgpu.js, three.tsl.js, and the add-ons used, in vendor/jsm/)
• src/dev/shots.js, tools/ – photo points: the same scenes pictured and timed for every graphics change (node tools/shots.mjs <set>, then tools/compare.html); node tools/layout-fingerprint.mjs checks that a change left the river's layout as it was

Salmon Survival grew out of Desktop Habitats by Chase Lean, and is MIT licensed like it (see LICENSE). three.js is bundled under its MIT license (vendor/THREE-LICENSE.txt). The ground and rock textures are from Poly Haven, CC0 (assets/CREDITS.md); everything else — the fish, the plants, the water, the sounds — is generated in code.