GSW and Gamasutra sister company Game Advertising Online has capped its recent expansion by reaching 60 million monthly unique viewers for its online game advertising -- including over 14 million uniques in the U.S. and 3.3 million in the U.K.

The business, which was acquired by this site's parent division the UBM Techweb Game Network in February 2010, is now a top 70 Quantcast ad network in the U.S., with a recent high of 66.8 million worldwide monthly uniques, 14.5 million of those in the United States.

Game Advertising Online is particularly popular with free-to-play online game companies looking to rapidly acquire users with specific CPC and CPA targets. Its advertising network now includes over 200 websites, spanning video game, anime, and other game-friendly themes.

Other traffic highs for the network include February 2011 figures of 3 million monthly uniques in Canada, 3.3 million in the United Kingdom, and 7.6 million in Turkey, with a number of other sought-after countries also trending up.

Current advertisers on Game Advertising Online's network of sites include major firms like Bigpoint (Battlestar Galactica Online), Turbine (Lord Of The Rings Online), Outspark (Fiesta), Gameforge (Nostale) and many more.

Recent innovations for the network have included the Game Box format, which provides a miniature 'store' of F2P games to choose from, within a small widget on publisher sites. This high-performing unit has been added to traditional banner advertising and site skin options for the network.

Personnel from Game Advertising Online, which is seeking both new advertisers and websites to add to its network, will be at Game Developers Conference 2011 in San Francisco next week.

Interested parties wishing to meet with them can either visit the Game Advertising Online booth (#2139) on the GDC show floor from Wednesday, March 2nd to Friday, March 4th, or pre-arrange a meeting via the site's contact form.