The "Exclusive" aspect is what makes it precious. You aren't playing the mass-produced arcade cabinet. You are playing a forbidden, fan-edited relic from the golden age of emulation. It is unbalanced, glitchy, and utterly glorious.
Every SNK fan knew the history. The King of Fighters '99 introduced the Striker system, changing the three-on-three format forever. It was a chaotic, messy, brilliant evolution. But rumors persisted of a development build, a version titled Plus that never saw a commercial release. kof 99 plus rom exclusive