First of all, let's know that a hack is nothing else than a commercial game that other developers have recovered and have changed their way.
Here is King of Fighters 2002 that it is. 2004 will not see any King of Fighters from SNK Playmore. These enthusiasts have endeavored to give a new vintage to a series that has no hole and then nearly ten years.
Here, the 39 characters of the original are always present. Their special moves have also been retained. Only colors of sprites are somewhat different: color palette that has been changed, and not the graphics of the protagonists.
On the other hand, the backgrounds are completely new. Overall, it's pretty good, but some are really incredibly ugly.
There is no scenario, and no intro: it's a game made for playing.
In short, it's a game of fans, and it also feels physically. The cartridge does not weigh much. When opened, we understand why: The PCB is tiny and looks very cheap.