This version is actually a "hack" or modified version of the classic The King of Fighters 2002 . Because of the unlimited power, players can perform and complex combos at will, which isn't possible in the standard versions of the game. Other notable features include:

It includes all original characters, with some appearing twice but having different abilities and balances.

The game uses backgrounds "ripped" from various other SNK fighting games, giving it a unique visual feel similar to Mugen.

If you need help with the installation process from that specific site, this guide walks through the typical steps:

If you are downloading it as an .exe from a site like ApunKaGames , it typically runs through the WinKawaks emulator , which allows for customizable controls and save states.