Google is serious about casual gaming.

At last week's Casual Connect conference in Seattle, Google's "AdSense for Games" presentation made it clear the company "was actively optimizing AdSense to work with web-based casual games" with plans to move into PC and console games later on, according to GigaOM.

As it stands, AdSense cannot be properly integrated into Flash-based games and are instead marooned on the outer fringes of a webpage displaying a game.

With 1 in 4 web users visiting gaming sites, this is big news for game developers.