clean". Although music and sound effects were kept from the original recording sessions, original master recordings have been used to update the soundtrack at a higher quality; the original recording size was 16 MB, while in the remaster it is over 250 MB. Developers retained 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 because it was considered essential for speedruns. Marketing and release Perfect Dark was first teased to consumers in April 2009 via a screenshot of a Rare employee's Xbox 360 dashboard which showed an icon for the game. It was confirmed to be in development on June 2, 2009 via Xbox Live Director of Programming Larry Hryb's Twitter account. The game was released on March 17, 2010 as part of Microsoft's Xbox Live Block Party promotion. As a cross-promotion with Crackdown 2, players with a Crackdown 2 saved game on their Xbox 360 hard drive could unlock that game's protagonist, known as Agent 4, as a playable skin in the game's multiplayer mode. A title update was released in April 2010 which addressed bugs, added two control schemes, and expanded playlists. Perfect Dark was downloaded over 150,000 times during its first week of release and grossed approximately $1.61 million at the end of the month. The game has sold more than 285,000 units as of August 2010 and nearly 325,000 units at the end of 2010. As of year-end 2011, sales had increased to nearly 410,000 units. In 2015, Perfect Dark was included in the Rare Replay compilation for Xbox One. In 2019, the game was enhanced to run at native 4K resolution on Xbox One. Reception Perfect Dark received "generally favorable" reviews from critics, according to review aggregator Metacritic. Writing for 1UP.com, Scott Sharkey highlighted the technical improvements, stating that the remaster is "a great way to re-enjoy a