Think of it as the Super Smash Bros. Ultimate of the Neo Geo era. The developers took the sprite-based assets from KoF ’94 through KoF 2003 (and even some Samurai Shodown and Fatal Fury assets) and crammed them into the KoF ’98 engine. The primary draw of this MAME ROM is the roster. Traditional KoF ’98 has about 38 characters (including Orochi variants). The 39-98 Anniversary Edition pushes that number past 50, but the "39" in the title is a misnomer covering the teams rather than the fighters.
The is a massive, unauthorized ROM hack created by an obscure Brazilian or Chinese modding team in the early 2010s. The "39" refers to the 39 unique character slots available on the character select screen. The "98" refers to the engine base: The King of Fighters '98 (KoF '98), widely considered the most balanced and technically sound game in the entire franchise. king of fighters 39-98 -anniversary edition mame rom-
You should only download this if you own a legal copy of The King of Fighters ’98 for a legitimate console (Neo Geo CD, PS1, PS2, or Steam). Emulation is for preservation and historical curiosity. Where to Find the ROM (And How to Spot Fakes) Searching for the exact string "king of fighters 39-98 -anniversary edition mame rom-" will lead you down a rabbit hole. Beware of survey scams. Think of it as the Super Smash Bros