 Perfect Dark was ported by <unk> Studios , the same studio that previously developed the Xbox Live Arcade versions of Rare 's platform games <unk> @-@ <unk> and <unk> @-@ <unk> . According to Microsoft Game Studios creative director Ken <unk> , the development team " took the original code , ported it to the Xbox 360 and included deep [ Xbox Live ] integration . " The game was developed over a course of approximately 11 months after the creation of a working prototype . As the Xbox Live functionality had to be written from scratch , the developers opted to completely rewrite the game engine rather than do a port through emulation . As a result , although the game plays exactly the same , the code and renderer is different . The game also runs at <unk> and 60 frames per second . 
