This application allow you the usage of either a yellow or a red card, like the ones used by a referee.
You can use them to caution or to send off your friends, as a joke.
You can also use the application to became a referee 2.0.
Every time a UEFA EURO 2012 referee does not use its cards you can use your against each player you want, it does not help the situation but it is a little and personal outlet.
It has been added the whistle buttons. So you can do one whistle, two whistles or three whistles, or event more ... till 9.