After several years of success as a modification, Valve Software hired several members of the team in the summer of 2002 to work on the game internally, with other members continuing to work from locations around the globe. The retail version of Day of Defeat will contain nine brand-new maps, as well as revamped versions of 6 current DoD levels. According to Valve's Doug Lombardi and DoD player animator John Morello II, almost everything has been touched, especially in the art department. Other major additions for the retail version: a British team has been added for the Allies, and a particle system has been added to the current Half-Life code base.