King Of Fighters: Maximum Impact
Successfully complete all challenge mode missions to unlock the Cemetery stage.
Successfully complete 25 challenge mode missions to unlock the Esaka stage.
Successfully complete 25 challenge mode missions to unlock the Infernal Gate stage.
Successfully complete 10 challenge mode missions to unlock the Show Time stage.
Successfully complete story mode with Soiree and Alba to unlock Duke.
Successfully complete a challenge in challenge mode.
Successfully complete the game to unlock the corresponding character in the profile screen. You will also be able to select their rigging model in their profile and use it during the game.
To get 30 hits in one of the challenge mode missions, use Ryo's Whipslash Bash with a Light Punch, then use his level 2 special.