Spil Games has 170M monthly visitors who spend as much as $60 a month

Spil Games said today that it has 170 million monthly active visitors to its various teen-girl-focused game sites.

People who play the free-to-play social games, where users can play for free and pay real money for virtual goods, spend as much as $60 a month on transactions.

The company said that in 2011, players played 11 billion game sessions, or 350 games started every second. The top game was Bubble Shooter, in which 5.3 billion bubbles were blasted.

Since introducing social games to its stable of web games in July 2011, Spil Games, based in Hilversum, the Netherlands, has grown its global average revenue per user by 30 percent each month.

Teen boys generate some of the highest average revenue per paying user, resulting in $60 per month per user spending in Germany.

“The breadth of our offering and the personal approach available to developers is driving the kinds of numbers we’re seeing on our platforms,” said Peter Driessen, chief executive. “Players clearly want to go to a platform specializing in online gaming.”

Developers of top games could make $5 million per title in 2012 on the Spil Games platform, Driessen predicted.

Spil Games supports in-game payments in 60 countries. Players spend 85 minutes per month playing online games. Brazil and the U.S. have the most online gamers.