The setting of Battlefield

2 shifts to a fictional modern military warfare, while the weapons, vehicles and other equipment that players use in the game are derived from the real thing. The game uses the vastly improved Refractor 2 engine, with significant improvements in graphics and sound effects. The game even adds a commander system and squad system, making teamwork even closer and more competitive. The game supports up to 64 players online simultaneously, while for the first time a scaled-down version of the map has been designed for 16-player skirmish matches. Battlefield 2 sold over one million copies in its first week of release. Battlefield 2 was also a hit for several years, and as of September 2009, the update service for Battlefield 2 itself and the production of third-party modules had not completely stopped.