 Although music and sound effects were kept from the original recording sessions , original master recordings have been used to update the soundtrack at much higher quality ; the original recording size was 16 <unk> , while in the remaster it is over 250 <unk> . Developers also decided to retain the free aim mode because they wanted to be faithful to the original game . According to Rare 's Producer Nick Ferguson , " We didn 't change the fundamental behavior of the aiming system simply because that is not how Perfect Dark was played " . He also observed that the idea of updating the controls was actually seen as a flaw in Perfect Dark Zero , which tried to " combine the original Perfect Dark system with aspects of Halo " . The original diagonal running , which allows players to move faster than by running forwards or sideways alone , did not work the first time they implemented the analog stick , so it was manually rewritten as it was considered essential for <unk> and achieving some of the target times required to unlock cheats . 
