The King of Fighters 2000/2001 Cheats

In order to unlock Zero, play through Party Mode unlocking every hidden Striker in the game. Party Mode will instruct you on how to unlock the Strikers until you've unlocked them all. Once this is accomplished, you may select Zero for play in Single and Team Versus or Practice Modes. In order to select him, choose your character and Striker normally at the Character Select screen. Once the Order Select screen comes up, select your primary character with the X button WHILE holding down Up+Square or Up+Circle (For Player 1 or Player 2 colors respectively). It is easier to, once you've chosesn your characters at the Character Select screen, immediately press and hold down Up+Square or Up+Circle before the Order Select screen comes up, and then, while still holding them down, press X to select the character at Order Select. If you've done it correctly, a mechanical noise will sound and Zero's head shot will replace your character's. You'll be playing as Zero when the round starts!

NOTE: The secret characters are not the hidden strikers.

These strikers are not usable characters,
You should play party mode to unlock the following strikers.