From Tetris and Gluttony, to Warcraft and DOTA2 in the PC era, we have experienced the rise of the MOBA era, and we have collectively participated in the development of the mobile gaming era. And Jane McGonigal, author of Games Changing the World, estimates that people around the world have been playing games for more than 3 billion hours a week.►What is the nature of the game? Before answering this question, the author thought of what is the factor that drives us to play the game? The answer...