GravityInk is creation-as-play on a dark desk. Draw luminous ink strokes, tap Play, and real 2D physics turns your lines into glass fills, sled tracks, or goo bridges.
Free demo may show a light interstitial between levels — never while you draw. One-time lifetime remove-ads unlock (`gravityink_remove_ads`). Progress stays on this device. Offline. No account. Google Play Billing handles payment; we never see card details.
Honesty built in: physics ink toy — not a CAD tool, not LightTrace long-exposure painting, not a multiplayer sandpit. Creation is the play.
Draw luminous ink, tap Play — physics turns strokes into play.