In 2009, game designer and author Jane McGonigal suffered a severe concussion that wouldn't heal. Unable to think clearly, or work, or even get out of bed, she became anxious and depressed, even suicidal - a common symptom for concussion sufferers. But rather than let herself sink further, she decided to get better by doing what she does best: she turned her recovery process into a game. What started as a simple motivational exercise became a set of rules she shared on her blog.