Orochi Iori and Orochi Leona: Defeat 27 opponents in party mode or
accumulate more than 10 hours of game play. Orochi Leona will
replace Ralf and Orochi Iori will replace Benimaru when selected.
Wolfgang Krauser and Mr. Big: Defeat 36 opponents in party mode or
accumulate more than 15 hours of game play. Wolfgang Krauser will
replace Mai and Mr. Big will replace Takuma when selected.

Heidern: Defeat 40 opponents in party mode or accumulate more than
20 hours of game play. Heidern will replace Whip when selected.
Orochi: Defeat 70 opponents in party mode or accumulate more than
least 30 hours of game play. Orochi will replace Leona when
selected.

Krizalid: Defeat 99 opponents in party mode or accumulate more
than 40 hours of game play. Krizalid will replace K' when
selected.

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: Successfully complete the game under the
expert difficulty setting.

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: Defeat 10 opponents in party mode.
Ron: Defeat 20 opponents in party mode.
Krazalid: Defeat 30 opponents in party mode.

King Of Fighters 2001: Stages:
Korea: Defeat 40 opponents in party mode.
Japan: Defeat 50 opponents in party mode.
China: Defeat 60 opponents in party mode.
USA: Defeat 70 opponents in party mode.
Brazil: Defeat 80 opponents in party mode.
Italy: Defeat 90 opponents in party mode.
Mexico: Defeat 100 opponents in party mode.
Zero: Defeat 110 opponents in party mode.
Igniz: Defeat 120 opponents in party mode.

King Of Fighters 2001: Fighters:
Zero: Defeat 150 opponents in party mode.
Igniz: Defeat 200 opponents in party mode