The famous research of the psychologist Csikszentmihalyi about the "optimal experiences" reveals that experiences are really satisfactory only when we enter a state of consciousness called "flow." 

During the flow, we experience pleasure, creativity and get involved completely with our life. The good news is that we can control this state of self - affirmation. 

Flow teaches us that if we order the information that enters our conscience, we can discover true happiness and improve our quality of life. Csíkszentmihály analyses in this book how to encourage flow in people and how this can be related to intrinsic and extrinsic motivation that we can generate through the game.