The King of Fighters 2000 Cheats

On the character select screen, various characters have a third costume color. You can access the third color by pressing X and Y at the same exact time when selecting your character. Characters that have this feature include Benimaru, K', Kyo, Iori, Whip, Ryo, Choi, Terry, Blue Mary, Mai, and Kensou.

In Practice Mode, choose any two characters for yourself and then choose your computer opponent and it's striker. Now when choosing your team order Hold Up and press Hard Punch to pick the first character (fighting character) and a mechanical noise will sound. The striker character will then automatically be chosen. Now select the team line up for your computer opponent. Now, when the practice begins you will be playing as Zero. Note: Zero does not have any strikers.

In the Striker Select screen, go to the Another Striker picture and press and Up, Left, Left, Left, Right, Right, Right, Down. A hidden striker will appear. It will only work on the characters below.

Ramon - Neo & Geo
Ryo - G-Mantle
Kasumi - Unknown (Kasumi's father Todd)
Chang - Smart Chang
Choi - Cool Choi
Kyo - Saisyu
Iori - Another Iori
Kula - Rugal