The King of Fighters 2002 (kof2002, neogeo arcade) - ザ・キング・オブ・ファイターズ 2002 チャレンジ トゥ アルティメットバトル
Here I just show an unused move Ryo has, his The King of Fighters 2000 / 2001 QCB + A / C. Apparently the move is inside KOF 2002 but it is unused, for now replacing move is kind of easy to do, here QCF + C was removed just to have a look at the unused move, but more knowledge of the game is needed to add this move instead of replacing an already existing move.
As you can see, the move is a little bit bugged, it has weird sparks in the middle of Ryo's feet, so in case it is not hard to add it, it also needs to be modified in order to ensure it will behave properly.
There are more unused moves that look interesting, so I might bring more videos like that showing you some of the other hidden moves inside KOF 2002.
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