Mobsters developer Playdom has invested $5 million in Metro Games, a social gaming studio headquartered in Buenos Aires, Argentina. With the financing, Playdom's CEO John Pleasants joins the company's board of directors.

Playdom describes the Argentinian developer as "promising" and expects "explosive growth" from the company. MetroGames intends to use this Series A investment to expand its pipeline of games and to continue work on its Metrogames.com social gaming platform.

MetroGames has released more than 30 titles on Facebook, including games like Music Challenge, Waka Waka, Pixel Ranger, Word Island, and several others. The developer says it plans to put out 'many more" titles in 2010.

Since receiving $43 million in Series A funding last November, Playdom has opened its wallet to fund "aggressive plans to expand [its] social gaming footprint in 2010", including its acquisitions of Green Patch (Lil Green Patch), Trippert Labs (Fighter Jets), and most recently Offbeat Creations (Super Farkle).

"We are very confident MetroGames will become one of the world leaders in social gaming during this next wave of explosive growth in the industry," says MetroGames CEO Damian Harburguer. "We already have more than 30 games online across Facebook and our own social gaming platform and many more to be released during 2010. We are pleased Playdom has recognized our potential and chosen to invest in us."