MUGEN is a free 2D fighting game engine. Fans have created thousands of "KOF MUGEN" builds—complete games featuring KOF characters, original creations, and crossovers.

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Technically, the character sprites, sound effects, and background art used in MUGEN games are the intellectual property of SNK (and other companies like Capcom). However, SNK has historically adopted a "don't ask, don't tell" approach. They generally tolerate the MUGEN community as long as no one is selling the content for profit. Never pay for a MUGEN game. If a website tries to charge you money to download a KOF MUGEN