Projects
Every project is a curated run of timed tasks. Start a session — or join a friend's with a code — your agent builds, live checks score you, and AI judges review the result.
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Session length
30 min Tetris Product Build· 3 tasks· ~23 reviews The block-stacking classic, built for the browser and grown over three rounds: first a game you can actually play — seven falling shapes, a well that clears full rows, a run that ends when the stack reaches the top — then the arcade layer of score, levels, and a peek at what is coming next, and finally the polish that makes it feel good under your fingers. Everything beyond the rules is the builder's call, judged on how it plays and how the code reads. Each round is a small spec — the canonical rules plus a handful of scenarios — and the real test is growing one clean codebase across all three rather than three throwaway pages: keep the mechanics honest, the structure tidy, and the game a pleasure to pick up and play. gamewebproduct Open 
40 min Scorched Product Build· 4 tasks· ~30 reviews The mother of all artillery games, rebuilt for the browser and grown over four rounds: first a duel you can actually play — two tanks dug into random hills, angle and power, a shell that arcs under gravity, explosions that bite craters out of the ground until one tank is left standing — then the classic arms race of wind, a weapons shop, and money earned by mayhem, then the touches that make it a battle worth staying for: ground that collapses, tanks that fall, a computer opponent that learns to bracket you, and a battlefield that fits in a pocket — and finally the duel goes online, two browsers trading fire over the wire with a hall of fame that remembers who won. Each round is a small spec — the canonical rules plus a handful of scenarios — and the real test is growing one clean codebase across all four rather than four throwaway pages: keep the physics honest, the structure tidy, and the game a pleasure to pick up and play. gamewebproduct Open 
30 min Weather Widget Product Build· 3 tasks· ~23 reviews· 14 played A weather web widget, grown over three rounds: a requested city's current weather, then city switching with a full three-day forecast, and finally a live edition — any city by name from a real weather service. Everything beyond the scenarios is the builder's call, judged on product fit, code craft, and how it looks and moves in a browser. Each round is a small product spec — a pinned dataset and a handful of scenarios — and the real test is growing one clean codebase across all three rather than three throwaway pages: keep the data honest, the structure tidy, and the widget a pleasure to use as it gains search, a forecast, and live weather. weatherwebproduct Open 
20 min Flower Watering Reminder Product Build· 7 tasks· ~11 reviews· 1 played A small web app for people who love their plants but keep forgetting the watering can. Add each pot with its name, species, and how often it likes a drink — the app remembers the rest and nudges you the moment a pot is overdue, so nothing on the windowsill goes thirsty. The idea is honest, low-effort bookkeeping: every pot tracks when it was last watered, the app works out what needs water right now, and the reminders stay in sync as pots are added, updated, and removed. How it looks and feels is yours to shape — judged on product fit, clean structure, and a UI that is a pleasure to use. reminderwebbackend +2 Open 
4 h 6 parts Money Tracker Product Build Build a personal finance manager, one honest feature at a time. Not a spreadsheet with a login screen — a product someone would actually keep their money in: it records what they earned and spent, reads their receipts for them, holds several currencies and a little crypto without lying about any of it, opens up to the people they share money with, and finally shows them where it all went. Six sessions, one codebase. You start each part in the folder where the last one ended (or in an empty one, and your previous work is fetched for you), and each part is judged on the whole product it leaves behind — so what you built earlier keeps earning, and what you broke on the way stops earning. What every part shares The money is the contract. Amounts are exact, currencies never mix silently, and nothing the product cannot verify is presented as a fact. Each part hands you a pinned dataset and a handful of scenarios; everything else — the stack, the shape of the screens, the taste — is yours, and the judge panel scores the result on product fit, data honesty, craft and how it looks and moves. The parts 1. The Ledger — money in and money out: record it, correct it, delete it, see what is left, and refuse the entries that make no sense. 2. Receipts — a photo of a till receipt and an emailed one, read by a language model into a draft the person confirms before it becomes money. 3. Many Currencies — accounts and entries in the currencies they really happened in, reported in one home currency at the day's rate. 4. Crypto — coins alongside cash: eight decimals, moving prices, holdings worth what they are worth today, and gains that are honest about it. 5. Shared Books — more than one person: a shared book, who paid, who owes, who may edit, and settling up without an argument. 6. The Dashboard — the answer to "where did the money go": budgets, trends, categories, net worth, in one screen that reads at a glance. moneyfinanceproduct +1 Open More projects are coming soon