More than 15 billion apps have been downloaded from Apple's App Store in the three years since launch.
The store boasts over 425,000 apps, 100,000 of which have been specifically designed for the iPad. Apple has paid more than $2.5 billion to app developers.
"iPad provides us with an unparalleled mobile device for creating gorgeous, immersive games," said Mark Rein, vice president and co-founder of Epic Games.
"Infinity Blade has been a runaway hit with customers around the world and we couldn’t be more excited about our success on iOS devices."
Apple claims there are over 200 million iOS devices in use.