This app listens to you to clap your hand. You need to give it permission to use your microphone. You might be asked by Chrome (upper right corner) and you will be asked by Scratch (center screen). You need to first answer Chrome before you can answer Scratch. You might need to "See inside" before you can answer "Allow".
Cat jumps thru a hoop. Hoop is split into left and right. Left is in front of cat, right behind, gives 3-D impression. Will jump upon clap. You might wish to modify according to the sensitivity of your microphone.