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If you’ve ever played Destiny, Diablo, or EverQuest, or even games like Call of Duty, you know leveling systems are beyond addicting. You’ll play a game far after it’s stopped being fun simply because there’s the possibility of an increased level, a new achievement, or additional item. That’s why you’ll spend five hours killing rats just to get to the next level, as you’ll then unlock a new sword or spell that gives you a chance to gain . . . yup, another level. These leveling systems are designed specifically with human behavioral psychology in mind. As I told you earlier in the book, our brains love progress, and we love to be rewarded when we make progress. It’s the same psychology behind why we feel good when somebody likes the photos we post to Facebook: we take an action, and we are rewarded for it. What’s going on here? When these activities take place, our brains release dopamine, which makes us feel better and more accomplished. And then we chase that feeling. In fact, our brains can actually create new pathways with each repeated cue and reward. Once we understand this process, it becomes our responsibility to use it for good rather than for evil. Although I don’t play games like EverQuest very often anymore due to the time commitment they require and to my own admitted addiction to these types of games, I am still addicted to progress and leveling up. I just do it in real life now.
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Steve Kamb (Level Up Your Life: How to Unlock Adventure and Happiness by Becoming the Hero of Your Own Story)