Are you interested in using gaming to generate coinbases? Is gaming what rewards new coins or are you talking about a game that uses real world currency?

I found deedbot.org one day, which is an auction system for a game called Eulorum. Eulorum uses crypto in game. I've never played the game, so I'm not too sure how it all works, but it's the first crypto implementation I've seen in a game besides something like satoshi dice.