"Battlefield 2" is a multiplayer video game played via the Internet or on a local area network. A single-player mode with three difficulty levels is included. Both player modes use the same maps and use "Battlefield"s conquest game mode. Single-player mode allows 16 computer-controlled players while Internet mode allows up to 64 players. Players can choose to play as the United States Marine Corps, the People's Liberation Army, or the "Middle Eastern Coalition". Additional factions are playable through the expansion packs, such as the European Union. Progress in the game is made via promotions which allow additional weapons to be unlocked. By playing the game on ranked servers, players are able to add to their global player statistics. These statistics are used to award promotions and other achievements.