A few days ago Google announced that they are rolling out AdSense for Games, also known as In Game advertising. See below for a quote from the official Google blog and a video:
Â “Do you develop or publish web-based games? If so, you’re contributing to a growing trend – according to comScore, over 25% of Internet users play online games every week, which is over 200 million users worldwide. As a beta user of AdSense for Games, you can display video ads, image ads, or text ads within your online games to earn revenue. You’ll be able to show these ads in placements you define, such as interstitial frames before a game, after a level change, or when a game is over. Members of our AdWords team will sell your in-game ad placements directly to top brand advertisers, and you’ll also see contextually targeted text and image ads based on content and demographic information. In addition, you’ll be able to control the ads you see on your pages using our filtering options.”
Read more here.