You feel really happy when you're online or when you're playing games, but as soon as you have to stop, you get angry or upset.
You think about going online or playing when you are supposed to be focusing on other things, like doing school work or having dinner with your family.
You spend more time with your keyboard or controller than physically hanging out with your friends.
Your friends or parents ask what you spend all your time doing, and you lie about it or laugh it off, but inside you know they may have a point.
You get up in the middle of the night to check your e-mail or your MySpace comments because you're having a hard time sleeping.