Tex.-based retailer GameStop reported a substantial jump in earnings for its fiscal Q2 ended August 2, leading the company to up its full year earnings guidance.

Big titles titles such as Grand Theft Auto IV, Metal Gear Solid 4: Guns of the Patriots, NCAA Football 09, Wii Fit and Battlefield: Bad Company drove quarterly earnings up 162 percent year-on-year to $57 million (£30 million), beating guidance.

Sales were up 35 percent to $1.8 billion (£960 million).

GameStop noted the stronger than expected Q2 results and an "increased confidence in the second half video game line-up," raising its full year earnings per share forecast to range from $2.45 to $2.50, a 36-39 percent growth rate over last year.

Total sales are expected to grow in the range of 23-25 percent.

GameStop generated sales of $7.1 billion (£3.9 billion) in 2007, and earnings of $288.3 million for the year.

For the rest of the year, GameStop is counting on big figures from Guitar Hero: World Tour, Call of Duty: World at War, LEGO Batman, Little Big Planet, Spore, Fable 2, Rock Band 2 and Gears of War 2.