Hambidextrous

Go HAM with both hands!

A chaotic, kawaii, WarioWare-style micro-game frenzy for phones that secretly trains ambidexterity. A session is a two-half competition: one hand (picked at random) plays a shuffled set of 6 mini games, then it's HALFTIME, and the other hand plays the same 6 games in the same order trying to beat each score. The finale reveals the results game by game and crowns the CHAMPION HAND. 👑

A full session (12 rounds) runs in under 2 minutes, with a metronome ticking under everything and a beat-synced 5‑4‑3‑2‑1 count before each game. The tempo speeds up every round.

Names & world records

Tapping TAP TO PLAY asks for the player's name before the session starts. The name lives only for that game: the finale's 🏠 HOME button clears it and returns to the title screen, and the next TAP TO PLAY asks again, so a phone passed around a group always credits the right kid. Personal bests are remembered per name on the device. Every finished round is sent to a global leaderboard: per game, the top 10 scores in the world, with the hand that set them. A round that beats the world's best gets a 🌍 NEW WORLD RECORD! and beating your own best gets a ⭐ personal best. 🌍 WORLD RECORDS on the title screen shows the record holder for every game, and tapping a game shows its top 10 (plus a running "lefties hold X · righties hold Y" tally).

Syncing is asynchronous and lossless: scores go into a localStorage outbox the instant a round ends, then flush in the background with retry and exponential backoff. If the phone is offline or the tab is closed, the outbox survives reloads, a sendBeacon fires on page hide, and client-generated ids make every send idempotent (the server does ON CONFLICT DO NOTHING), so retries never double count and nothing is lost.

Backend: Netlify DB + Netlify Functions

• netlify/functions/scores.mjs serves GET/POST /api/scores using @netlify/database.
• netlify/database/migrations/0001_create_scores/migration.sql creates the scores table; Netlify applies migrations automatically on deploy (the function also runs a CREATE TABLE IF NOT EXISTS fallback so a fresh database never errors).
• Netlify provisions the database automatically on the first deploy; deploy previews get their own isolated database branch, so preview leaderboards don't mix with production.
• Run npm test for the function's unit tests. For local dev with a real database use netlify dev (which starts a local Postgres) instead of a plain static server.

Play it

Hosted on Netlify: connect this repo as a new site and deploy. netlify.toml already sets the publish directory to the repo root with no build command, plus caching and security headers. Locally, just open index.html (or serve the folder with any static host). Tap Add to Home Screen for a full-screen app feel. Sound needs a first tap to unlock. On Android the system back gesture is trapped while the game is open, so an edge swipe mid-game can't close the app (use the home gesture to leave).

• Use only the hand the screen tells you to (the HUD bar and hand icon change colour: 🔵 left, 🩷 right).
• Each round lasts 4–6 seconds. In the second half, every game card shows the other hand's score to beat.

The 10 mini games

	Game	How to play	Trains
🪙	Coin Toss	Tap the coins while they're flying	moving-target taps
🎯	Dizzy Darts	Tap the bullseye of a board that won't sit still	precision
✂️	Coupon Cut	Trace the dotted line to cut the coupon out	line tracing
🌱	Weed Whack	Pull weeds as they sprout (whack-a-mole)	reaction taps
🥞	Pancake Flip	Tap exactly when the pancake turns golden	timing
🍣	Sushi Slice	Swipe through the flying sushi	swipes
🐱	Pet the Cat	Rub the kitty back and forth	oscillating strokes
🎈	Balloon Pump	Tap as fast as you can to inflate it	tap speed
🐝	Bee Line	Drag the bee along a wiggly path to the honey	steady drag
🍬	Candy Sort	Drag each candy into the same-colour jar	drag & drop

Tech

Single self-contained index.html: vanilla JS, a 2D canvas, Web Audio for the metronome, count-ins and all sound effects (no assets, no build step). The only dependency is @netlify/database for the high-score function. manifest.webmanifest + icon.svg make it installable.

Tweakables live at the top of the script: GAMES_PER_SESSION, per-game dur, and bpmFor(). window.HAM.startSession(['coin','cat']) starts a session with specific games for testing.