Pause the game and press X + Y simultaneously. The "Pause" message will then disappear.
Play As Orochi Team
To play as Orochi team, go to the character selection screen and press START on Chris or Yashiro or Shermie.
Play As Rugal B
To play as Rugal B, complete the game once and go to character select screen press START at Rugal.
When you highlight the portrait of the following characters and hold START, you'll see their other portrait in the bottom left or right corner change. Press X, Y, A, or B (while holding start) to select a different version of that character.
The following are available:
Kyo, Terry, Andy, Joe, Ryo, Robert, Yuri, Mai, Yashiro, Shermie, Chris, Billy, & Rugal.
Highlight one of the following fighters at the character selection screen, then hold Start and press X: Andy, Billy, Chris, Joe, Kyo, Mai, Robert, Ryo, Shermie, Terry, Yashiro, Yuri.
Alternate Survival Mode
Successfully complete survival mode once. Then, highlight the "Survival Mode" option, hold Start and press A to fight individual characters instead of team battles.
To get an special ending (or a team picture) beat the game with these teams
Hero Team: Kyo, Terry, Ryo
Flame Team: Kyo, Saishu, Chris
Dream Team 99: Kyo, Iori,Chizuru
Sidekick Team: Benimaru, Andy, Robert
Head Band Team: Goro, Joe, Yuri
Rugal Team: Rugal, Vice, Mature
Family Tree Team: Ryo. Yuri, Takuma
Female Team 99: Athena, Mai, Yuri
Dangerous Team 97: Chin Chang choi
Sports Team: Ralf, Mary, Lucky
Heidern Team: Heidern, Ralf, Leona
Head Band Team 94: Terry, Clark, Lucky
Orochi Males Team: Yamazaki, Chris, Yashiro
Orochi Female Team: Vice, Mature, Shermie
Shingo Team: Shingo, Kyo, Saishu
Father Team: Kim, Saishu, Takuma
Rapid Button Team: Joe, Chang, Billy
Heavy Hitters Team: Brian, Ralf, Chang
The Crazy Team: Robert, Choi, Sie
Birthday Party Team: Shingo, Mature
KOF 2000 Team: Kyo, Iori, Shingo
Hold B when selecting the fighter order before a match. Note if any of the characters are neutral or friendly. If your fighter is stunned during the match, hold X + Y + A to have your teammates enter the fight.
After you finish playing, go to NEOGEO POCKET then to DOWNLOAD. Choose POINTPLUS and YES.
After you reach a certain number of points you will have access to secret 'KOF99 Millenium' images in the UPLOAD menu of the NEOGEO POCKET option.