Nonetheless this demonstration garnered significant attention as it showcases a free SDK called Epic's Unreal Development Kit (UDK)[1] The game uses dual zones with touchscreen control that are mapped as virtual joysticks.

The tech demo allows players to navigate through a fictional castle realm with various areas such as a circus bazaar, a river and a cathedral.

[3] Epic Citadel was a precursor to the video game Infinity Blade for iOS, which was released on December 9, 2010.

[4][5] It was the first gaming 3D engine to be ported to run within Flash Player, using the CrossBridge cross-compiler (also known as Alchemy).

Using additional technologies such as the C/C++ to JavaScript cross-compiler Emscripten, the application was ported to HTML5 supporting run time environments such as the Firefox web browser.