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Playstation 2 - Neo Geo Online Collection Vol. 1: Mark of the Wolves - Limited Edition cheats

Unlockable Artwork
Finish the game in survival mode with any characters

Unlockable ending Artwork
Finish the game with any character

Unlock Boss Character Kain
Highlight Terry on the character selection screen and press right. 

Unlock Boss Characters Grant
Highlight Rock on the character selection screen and press left.