Interactive math you can play with

New app — Packing Puzzles, now in closed testing

Packing Puzzles (app name ιPacking) — a collection of packing and puzzle games, from Huarong Dao and the 15 Puzzle to Tetris, 2048, and Block Clear, all on one exact geometry engine — is now on Google Play as a closed-testing preview. To install:

1. Visit our announcement-only Google Group driota and click Join the group. If you don't see that option, sign in first with the same Google account you use on Google Play.
2. Opt in to become a tester, and then install Packing Puzzles (free) from Google Play.

Prefer no store hoops? The same app runs in your browser — start from its app page. The driota group carries announcements of major app releases only — very low volume, no spam.

Animated Geometry free July 1–14

Animated Geometry (app name ιGeometry) is free on Google Play from July 1 to July 14, 2026 — normally $3.14. Grab it while the window is open:

• Install Animated Geometry free from Google Play (July 1–14, 2026).

Open testing on Android

Fantastic Fractals and Animated Geometry have moved from closed to open testing on Google Play. No group membership or tester opt-in needed anymore — install directly from the store:

• Fantastic Fractals, app name ιFractals: Install Fantastic Fractals (free) from Google Play.
• Animated Geometry, app name ιGeometry: Install Animated Geometry ($3.14) from Google Play.

Want a heads-up on new releases? Our Google Group driota carries announcements of major app releases only — very low volume, no spam.