Sudden Attack players are divided into two opposing teams: Special Force and Silent Fox Alliances. Each team is required to have at least one member and at maximum eight members. Players can also group into their own clans to fight within a separated network. Here players can show off group power, where teamwork and coordination play a crucial role. Strong clans can join ‘Clan Battle System,’ an exclusive competition mode in the game. Clan strengths can be proved clearly within this mode, as comradeship and cooperation are decisive factors to secure a win. Additionally, the game makes a breakthrough in comparison with preceding MMOFPS titles with the availability of in-water battle mode.