One of the reasons why video games are so popular and so easy to play for hours is because they set up quantifiable goals that allow you to understand whether you’re being successful or failing. It’s not just save the princess; it’s save the princess while scoring the most points or doing so in the fastest time. Hardcore gamers will sit for hours trying to gain levels, get treasure, discover secrets, complete side quests, and feel accomplished. Even gamers who play Match 3 games or Farmville have goals they can measure – one more level to complete or a certain score to attain. The numbers are tracked, saved, compared to your friends, and celebrated when milestones are reached.