2020 Smiles

[list][*]with open sound [icon]https://www.geogebra.org/images/ggb/toolbar/mode_cube.png[/icon][/*][*]better performance in full screen [/*][/list]
Based on an idea by [url=https://www.geogebra.org/u/patrick+cl%C3%A9ment]Patrick Clément[/url]

Information: 2020 Smiles