King Of Fighters 2000/2001 Cheats

King Of Fighters 2001: All bonuses:
Get a 200 win streak in party mode to unlock all bonuses, including all strikers, arcade mode stages, and Zero and Igniz as as guest characters at the options menu..

King Of Fighters 2001: Strikers: 

Glugan: By beating 10 opponents in party mode.
Ron: By beating 20 opponents in party mode.
Krazalid: By beating 30 opponents in party mode.
User Cheat by OldSchoolNinja

King Of Fighters 2001: Stages: 

Korea: By beating 40 opponents in party mode.
Japan: By beating 50 opponents in party mode.
China: By beating 60 opponents in party mode.
USA: By beating 70 opponents in party mode.
Brazil: By beating 80 opponents in party mode.
Italy: By beating 90 opponents in party mode.
Mexico: By beating 100 opponents in party mode.
Zero: By beating 110 opponents in party mode.
Igniz: By beating 120 opponents in party mode.

King Of Fighters 2001: Fighters: 

Zero: By beating 150 opponents in party mode.
Igniz: By beating 200 opponents in party mode.

Alternate colors:
Highlight Benimaru, Choi, K', Kensou, Kyo, Mai, Mary, Terry or Whip at the character selection screen, then press one of the following to choose them with the corresponding costume color. Color 1: Square or Triangle
Color 2: X or Circle
Color 3: X + Square + Circle + Triangle

King Of Fighters 2000: Introduction sequences: King Of Fighters '94: Accumulate more than 10 hours of game play
King Of Fighters '95: Get a 30 hit combo in practice mode
King Of Fighters '96: Set "Life recover" to "Quick" in practice mode and completely deplete your opponent's life.
King Of Fighters '97: Get 200 ability points in single play mode
King Of Fighters '98: Get 300 ability points in team play mode
King Of Fighters '99: Finish the game under the expert difficulty setting.

King of Fighters 2000/2001 Official Website

King of Fighters 2000/2001 Review - Arm Chair Empire

King of Fighters 2000/2001 Review - GameSpot