Metrogames might be a small player when compared to companies like Zynga or Playfish, but their games Biotronic, Music Challenge, and Plock have all managed to maintain around 1 million monthly active users on Facebook – more than enough to put them on the map. Playdom seems to think so too, as they’ve awarded MetroGames $5 million in series A funding to expand development of its games as well as its social gaming platform.

“We are pleased Playdom has recognized our potential and chosen to invest in us,” said Damian Harburguer, CEO of MetroGames. “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.”

Money isn’t the only thing Playdom is sending Metrogames way. Playdom CEO John Pleasants will be added to MetroGames Board of Directors, joining Harburguer and Metrogames COO Julian Lisenberg.

“We are really excited to partner with such a promising company,” said Pleasants. “MetroGames has a proven track record for developing very appealing social games, so we are convinced that with Playdom’s help they will become a big player in the social gaming market.”