All Infinity Blade games are on sale for just $1 each on App Store

The original Infinity Blade was one of the fastest-grossing apps in the history of iOS upon its release back in 2010. The game made $1.6 million in just four days after launch and more than $23 million in one year.

That's most likely the reason developers Chair Entertainment and Epic Games have decided to launch two full sequels that sold very well as well. Infinity Blade was originally developed to demonstrate the power of Unreal Engine for iOS. In fact, this was the first iOS game built on the Unreal Engine.

The final game of the Infinity Blade trilogy ...