These weren't official cartridges. They were ROM hacks. Specifically, we are talking about The King of Fighters 10th Anniversary and KOF Special Edition 2004/2005 . These hacks took the sprites from KOF 2002 (the best system, in my opinion) and mashed them with the move sets, bosses, and flashy effects of KOF 2003 and Neowave .
It is a blast. KOF 2005 (Fixed) represents a time when the community loved SNK so much that they refused to let the franchise die. While SNK was struggling financially, fans were at home coding in Street Fighter characters as secret bosses. King Of Fighters 2005 Free Download Neo Geo Fixed
If you are reading this, you have probably typed the same string of words into a search bar that I have at least a dozen times: “King of Fighters 2005 Free Download Neo Geo Fixed.” These weren't official cartridges
Let’s address the elephant in the arcade first. If you are a purist, you are already sharpening your pitchfork. "There is no KOF 2005!" you’re yelling at the screen. And technically, you are right. These hacks took the sprites from KOF 2002