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XBox - King Of Fighters: Maximum Impact - Maniax cheats

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.