King Of Fighters: Maximum Impact - Maniax cheats and cheat codes for XBox

Cemetery stage: Finish all challenge mode missions.
Esaka stage: Finish 25 challenge mode missions.
Infernal Gate stage: Finish 25 challenge mode missions.
Show Time stage: Finish 10 challenge mode missions.
Unlock Duke as playable character: - Finish story mode as Soiree and Alba.
New outfits: Finish a challenge in challenge mode.

Fighter profiles:
Finish the game with a fighter to unlock that fighter in the profile screen.
Note: You can select their rigging model also in their profile
and use it while playing.

Bonus 30 hits in challenge mode missions:
Use Ryo's Whipslash Bash combined with a Light Punch. After that
use his level 2 special.