A Java 1.1 applet from 1998, running in your browser with CheerpJ. Wait for it to load, then click to start. On a phone, tap to start and slide your finger around.
Move the mouse over the dark ball to blow it up. Touching a plain ball spawns another one. Clear all the balls before time runs out.
© 1998 Daniel Doubrovkine and Olivier Chekroun, University of Geneva. Source on GitHub.