Ever tried adsense? Now, adsense are available to games. Yes, google adsense in the games. If you are adsense publisher and want some extra money, there are two scenarios.
1.Try to contact flash game developer, and buy their games, insert the adsense code, publish the game. Or number 2, you can share your earning with games developers. It’s up to you. And no, I’m not interested yet in Adsense for games.