The King of Fighters '99: Millennium Battle, also called KOF '99, is a 1999 fighting game developed and published by SNK for the Neo Geo MVS arcade and home consoles in 1999. It is the sixth installment in The King of Fighters series following The King of Fighters '98, introducing a new story arc known as the "NESTS Chronicles" which is centered around a young man named K', who is formerly associated with a mysterious organization known only as NESTS. The game introduces several changes to the established KOF format, most notably an assisting character labeled "Striker". The game was ported to the Neo Geo CD and the PlayStation. Dreamcast and Microsoft Windows versions were also released under the title The King of Fighters' 99: Evolution[1] whose stages were remodeled in 3D. SNK had originally planned to remove main characters Kyo Kusanagi and Iori Yagami, who had previously appeared in earlier installments of the series, from The King of Fighters '99, but they ended up as hidden characters instead. The popularity of Kyo's previous incarnations resulted in him being given "clones" that wear his original clothes and perform his moves. SNK had difficulty balancing the age of the characters and teams. The Neo Geo AES and Dreamcast versions are both included in The Kings of Fighters NESTS Hen compilation released for the PlayStation 2 in Japan alongside other ports. Critical response to The King of Fighters '99 has generally been positive because of its fighting system and its use of Strikers. The Dreamcast port of the game has had a more favorable reception than the PlayStation version thanks to its loading times and graphics. While the game has sold well, overall sales have been less than those of the series' previous game because of poor sales of the console versions. The game was succeeded by The King of Fighters 2000.