Where we have the King of Fighters 98 Ultimate Match, and King of Fighters 2002 Unlimited Match, The King of Fighters XI is the third piece of the trifecta of the greatest old school King of Fighters games. You get a great roster, a lot of unlockable characters, tag battles, and cameos that actually tie into SNK history.
I really loved playing this game. It's different, but fun on its own. It's the only 2D SNK fighting game that I actually took the time to clear the challenge mode for. It was not easy.
But it was the one that I loved so much, that I would actually 100% it. It doesn't get the attention it deserves, it's as good as the other dream matche games in the King of Fighters series. I happily bought first two games listed here because this was the best way to get them. I would love to add King of Fighters XI to this, so I can have my Trifecta of perfect old school King of Fighters games. King of Fighters XIII is in its own space of greatness, because it's definitely a newer experience.