The story of King of Fighters Dream Match '99 takes place in a world where players are chosen by their clans to represent them in a tournament. The player's goal is to become the ultimate champion by defeating other opponents and their clan leaders.
King of Fighters Dream Match '99 features 3-on-3 team-based fighting gameplay, where players can choose from a wide range of characters with unique abilities and special moves. Each character has three "Power Gauge" levels that can be filled by landing successful attacks or defending against opponents' moves.
The game is set on September 30, 1999, for the Sega Dreamcast console.