FEATHER & FURY
Free simulation game · plays in your browser · made with Opus 5
Play FEATHER & FURY free in your browser: a simulation game with nothing to download and no sign-up. It takes after Time Management. Opus 5 wrote the code; the prompt that produced it is on this page.
About FEATHER & FURY
FEATHER & FURY is a timed farm-management game. A town map holds thirty rounds, each with a shopping list and a clock. Click the well to draw water; water sprouts grass; animals eat the grass and drop what they make; click the drop to send it to the shed. The shed is small, so load the truck and run it into town before everything backs up.
The shop is the game. Stars, earned by clearing a round and earned faster by beating its gold time, buy twelve machines laid out as four chains of three: eggs to powder to buns to cake, meat to tenderloin to bacon, milk to cream to butter to cheese, feathers to fans to hats to carnival suits. Stars also buy the well, the warehouse, the bear cage, the truck, the plane, a sheepdog and a cat, and all nineteen have three levels. A round only wheels out machines you already own, so the map stars any round you still have to shop for.
Coins never carry between rounds. Stars are the only thing you keep, and spending them does not lower your score. One number governs the rest: a patch of grass feeds exactly two meals, so water is what caps your output. Bears arrive from round eight - three clicks knock one out, and with a cage a fourth bags the most valuable thing you will ever sell. Twenty-five cast-metal trophies. Mouse only.
How was FEATHER & FURY made?
The prompt behind FEATHER & FURY
Build a timed farm-management game called FEATHER & FURY: a town map, thirty timed rounds, a shop between them, gold and silver medals, four animals, and 3D bronze/silver/gold trophy statuettes. The shop is the point — you are not only growing the animals, you are building the shops and transforming the raw materials into different things. Built as vanilla JS on one fixed 1000x720 stage with no build step. The shop is twelve machines in four chains of three, plus the yard, all bought with stars and all with three levels, and it is what gates progress: a round only wheels out machines you already own. The economy is tuned by a headless career simulator that plays all thirty rounds in sequence with a greedy shopper between them. It found the faults a per-level test called fine: the truck capping income far below the shop's prices, a working set too big for the shed, and a money round asking 26,000 coins off a field that tops out near 19,000. It now clears 30 of 30 without ever replaying a round to afford the next one, and it checks the star prices against the worst case — a player who clears every round and never earns a medal. The animals are pre-rendered from 3D: a small software rasteriser builds each one from parented primitives, lights it with a half-lambert cartoon rig, and bakes walk/idle/eat sprite sheets offline. The game blits frames and falls back to vector art if a sheet is missing.
Categories and tags
Questions about FEATHER & FURY
5
- Is FEATHER & FURY free to play?
- Yes. FEATHER & FURY is free, runs in your browser, and needs no account. Nothing to download, no plugin, no sign-up — open the page and play.
- Do I need to download or install FEATHER & FURY?
- No. FEATHER & FURY runs entirely in the browser on desktop. There is nothing to install and no launcher to sign in to.
- Which AI model made FEATHER & FURY?
- FEATHER & FURY was written by Opus 5, a model from Anthropic, using Claude Code. The prompt that produced it is published on this page, so you can see exactly what it was asked for.
- What is FEATHER & FURY like?
- It is a simulation game, filed by its creator under Time Management and Farming and Resource Chains. FEATHER & FURY is a timed farm-management game.
- Does FEATHER & FURY keep a high score?
- Yes. Any score FEATHER & FURY reports goes to the leaderboard under the game, and you do not need an account for it to count.
Version 3.0.1 · updated 2026-09-08