У вашего броузера проблема в совместимости с HTML5
In this appinventor.org screencast, Professor Wolber shows you how to build a Whack-a-Mole like game using the visual language App Inventor. Learn the basics of programming and build an app for your phone!
This video is licensed under an Attribution-NonCommercial-ShareAlike 3.0 Unported License.