This is a very simple, but hopefully fun app. It allows you to give someone a yellow, or red, or black card just like in a football match. You can also play a whistle to alert them to their punishment. This is done by pressing a "Whistle" button or long pressing (press and hold) on the card. You can also show or hide the title of the card to have a clean screen, or one that identifies the type of card. I hope you enjoy this app and have a bit fo fun with it.