Killer Instinct 2 is a fighting game developed by Rare, licensed by Nintendo and manufactured by Midway in 1996. A modified version of KI2 appeared on the Nintendo 64 as Killer Instinct: Gold, but a SNES version of KI2 was also developed and completed but never released. [Info from Wikipedia]
As noticed by Molasar:
On twitter in 2015 Tim Stamper shared a photo of his old gaming stuff with a KI2 SNES development cart pcb on it.
Post by Justin Fowler
Videos (from the arcade version):