King of Fighters: Maximum Impact - Maniax - Fight as Duke

Alternate costumes:
Successfully complete a challenge in challenge mode.

Fighter profiles:
Successfully complete the game to unlock the corresponding character in the profile screen. Note: You can now also select their rigging model in their profile and use it during game play.

Cemetery stage:
Successfully complete all challenge mode missions.

Esaka stage:
Successfully complete 25 challenge mode missions.

Infernal Gate stage:
Successfully complete 25 challenge mode missions.

Show Time stage:
Successfully complete 10 challenge mode missions.