Look around. Games are everywhere. Start with that carton of orange juice in your fridge, which might advertise it's worth three points, redeemable for discounts and prizes. It's a game. What about frequent-flier miles, which are games that reward loyalty? Mega Millions, Powerball, Take Five and other state lotteries? Games. Nissan has an in-car gaming system that encourages drivers to compete for best efficiency levels (Bronze, Silver, Gold, and Platinum). Talk about a mobile game. You could look at Twitter as a game, the pay off being more and more followers and greater numbers of retweets the more you use it.