Mind Lab

Nine small games where an AI watches your choices, learns your habits, and then proves it can predict what you'll do next. Try to be random; it's harder than it sounds.

▶ Open the live app · works on phone and laptop

 

Features

• Nine games — Color Pattern, Guess My Rule, Mind Reader, Pick a Random Number, Where Will You Click?, Rock · Paper · Scissors, Prisoner's Dilemma, Bank, and a Behavior Profile.
• It reads your secret rule — in Color Pattern you invent a rule about when to click, and a Bayesian engine works out the exact rule in your head and tells you.
• It plays scientist — in Guess My Rule it picks the most informative numbers to ask about until it knows your number rule.
• Honest scoring — every game shows the AI's measured accuracy next to what pure chance would get.
• Learns in real time — a team of simple pattern-spotters (frequency, recent history, win-stay/lose-shift, tit-for-tat) is weighted by how well each one is predicting you right now.
• Behavior Profile — sums up how predictable you are across all the games you've played.
• Private — everything runs in your browser; nothing you do is sent anywhere.

Built with

React + Vite, plain JavaScript models with Vitest unit tests, hosted on GitHub Pages.

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For developers

A small website of games where an AI watches your choices during a short "training" period, learns the pattern behind them, and then shows you it has figured you out. Everything runs entirely in the browser — no backend, no data leaves your machine.

The first game is Color Pattern: you invent a secret rule about when to click (based on the recent colors shown), and a Bayesian rule-inference engine deduces the exact rule in your head — including wildcards and "either/or" disjunctions — then announces it.

Run it

npm install
npm run dev      # http://localhost:5173

Other scripts:

npm test         # unit tests for the inference engine (Vitest)
npm run build    # production build to dist/
npm run preview  # serve the production build

Node is required. If npm isn't found on Windows, Node lives at C:\Program Files\nodejs — add it to PATH or call npm.cmd from there.

How it works

See PLAN.md for the design and research background, and PROGRESS.md for current status and next steps.

The core AI is in src/games/colorPattern/ruleEngine.js: a Bayesian posterior over every possible rule, with an Occam simplicity prior and a misclick-noise model. It yields both a live prediction ("should you click now?") and a confidence that drives the reveal.