Having spent time trying to guess the sales and revenue figures for Infinity Blade, it's good to get the official line.

According to Epic Games, which owns the game's developer Chair Entertainment, the title has generated more the $10 million in the first six months of release.

Significantly, it detailed this was 'earnings', so net income to Epic, rather than a gross figure that includes Apple's 30 percent cut.

As well as the price of purchasing the game, originally $5.99, Infinity Blade also includes IAP, which the company revealed has generated 43.7 percent of total revenues since it was introduced two weeks post-launch.

Big hit

"It's exciting to see the market so quick to embrace a premier handheld gaming experience such as Infinity Blade, and we couldn't be happier with the warm reception," said Donald Mustard, Chair's creative director.

"Furthermore, Apple has created an exciting, developer-friendly environment for iOS that has opened up many new doors for us."

Adding to the bonhomie, Epic's vice president, Mark Rein also pointed to the success of Infinity Blade in terms of driving use of the company's Unreal Engine 3 for iOS game development.

Saying it has created significant licensing interest in Unreal Engine 3 from developers worldwide, Rein said, "Infinity Blade's success proves that triple-A gaming experiences can be hugely successful on iOS and that there is a valuable, pent up demand for premium content like this.

"We have been licensing Unreal Engine 3 very affordably to developers large and small for all kinds of games and applications and we're looking forward to our licensees achieving spectacular results of their own."