A calm musical game about numbers. Tap the glowing disc when its number fits the rule ("even", "divisible by 3", "prime"…). Every tap is a note: right answers build a generative melody, and each level ends with a portal into the next world.
Play in the browser: lruns.one/hm (also on GitHub Pages). lruns.itch.io/hm still hosts the previous version for now.
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- 5 worlds x 17 levels, from warm counting to prime numbers; star gates, milestones, surprises (gifts and tricks, tricks honestly crossed out), explanation cards for every rule.
- Endless mode and number of the day: one task for everyone, new every day.
- Generative music: WebAudio synthesis with no audio assets on the web; on Android the same music as pre-rendered loops (cheap on the phone's CPU). Combo curve drives the mix.
- Progress is saved mid-session; combos, lives, records, encyclopedia in pause.
- Stack: Vite + TypeScript + PixiJS v8, Capacitor for Android.
npm i
npm run dev # web, http://localhost:5173
npm run build # static web build in dist/ (this is what GitHub Pages serves)
npm run sync # build + copy into android/ (uses HM_LOOPS=1 for music loops)
scripts/build-android.sh # signed release; keys live outside the repo (see android/app/build.gradle)Signing keys, store listings and promo material are not in this repository.
Happy Math started as a paper sketch in 2016 and was released on Google Play in 2020 as a
libgdx game. That code lives untouched in the branch
libgdx (tag v1.0.2) for historical reference.
The 2026 version on main is a full rewrite: web first, PixiJS, music played by your answers.
Both are published under the same app id, so the new version arrives as an update.
GPL-3.0, see LICENSE (same as the 2020 version).