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Playstation 2 - King of Fighters: Maximum Impact cheats

Unlock Duke - Finish story mode as Soiree and Alba. 
Unlock Other Outfits - Finish a challenge in challenge mode
Unlock Show Time Level - Finish 10 challenge mode missions
Unlock Infernal Gate Level - Finish 25 challenge mode missions
Unlock Esaka Level - Finish 25 challenge mode missions
Unlock Cemetary Level - Finish all challenge mode mission

Profile + Rigging Models:
Finish the game with any character on any difficulty mode.
After go to the profile menu and choose the character you defeated the 
game with. Their profile should be available. You can choose
their rigging model in their profile also and play with in the game.