King Of Fighters 2001 Codes -

Puzzle mode:
Successfully complete Single mode as any fighter.

Survival mode:
Successfully complete Team mode as any team.

Puzzle mode gallery:
Successfully complete Puzzle mode.

Fight as Zero:
Defeat Zero in Survival mode. Then, highlight the random option at the character selection screen and press .

Fight as Ignis:
Defeat Ignis in Survival mode. Then, highlight the random option at the character selection screen and press (2).

Gallery art:
Successfully complete Team mode to unlock gallery art for the team that was used. Complete Team mode with all teams to unlock the final set of art.