King of Fighters: Maximum Impact Cheat Codes for Playstation 2

Unlock Duke
Beat Story Mode with Alba and Soiree

Unlock Cemetary Stage
Beat all 40 Challenge Mode Missions

Unlock Esaka Stage
Beat any 25 Challenge Mode Missions

Unlock Infernal Gate Stage
Beat any 25 Challenge Mode Missions

Unlock Show Time Stage
Beat any 10 Challenge Mode Missions

Unlock Extra Outfits
Finish a challenge in challenge mode