In a deal that will help marketers reach a larger youth audience, Redwood City, California-based user-generated kids gaming site Roblox has appointed Stockholm, Sweden-based, youth-targeting online publisher Stardoll Media as its exclusive global commercial advertising representative.

The deal will give Roblox, which gives its users (87% male) tools to program and share their own video games and 3D worlds, the opportunity to leverage Stardoll’s audience (94% female) and advertising experience working with companies including Disney, Microsoft, and Sony.

Roblox.com, which targets kids ages six to 14, has 7.4 million unique visitors per month, and its users amassed 250 million hours of game-play in 2011. Stardoll.com, an online fashion and dress-up games community for girls, has more than 160 million registered users.