"The King of Fighters '99: Millennium Battle" is the sixth game in The King of Fighters series by SNK.
Unlike in previous games of the series, there are four characters per team instead of three, with the fourth serving as a "Striker", a fighter whose function is only to enter a match, attack the opponent and leave without replacing their teammates. In total, there are seven teams, each containing four characters, four Team Edit characters and a boss.
