One of my favorite projects I’ve worked on with SuperBetter Labs and my twin sister, superstar game designer Jane McGonigal, launched in May 2012: Oprah’s Thank You Game. The Oprah Winfrey Network and Oprah.com partnered with SuperBetter Labs to create a game that spread the benefits of gratitude to millions of people across the globe. Although the 30-day game is over, you can still learn the secrets of “giving good thanks” in this 3-min video that shares the science of how gratitude can improve your own well-being — and change the world.

So let the secrets be revealed: