The game was a critical and commercial success for id Software; with more than 3.5 million copies of the game sold, it is the most successful game by the developer to date. Critics praised the game's graphics and presentation, although reviewers were divided by how close the gameplay was to that of the original Doom, focusing primarily on simply fighting through large numbers of enemy characters. The game was followed by Doom³: Resurrection of Evil, an expansion pack developed by Nerve Software in April 2005, while a Doom film loosely based on the series was released in October 2005. A series of novelizations of Doom³, written by Matthew J. Costello, debuted in February 2008. An expanded and improved BFG Edition was released in the fourth quarter of 2012.