Mega Man 4 (USA) (Rev A) [Hack by Insectduel v1.0] (~Megaman Showdown IV) (Boss Mode) is a ROM hack by Insectduel of Mega Man 4 (USA) Rev A. This version appears to be a less extensive modification than the "EX" versions, focusing on the "Megaman Showdown IV" alterations but featuring only a Boss Mode. It retains the altered storyline and gameplay mechanics from the original hack but without the expansions of the "EX" versions. The original gameplay is greatly altered here.

Mega Man 4 (USA) (Rev A) [Hack by Insectduel v1.0] (~Megaman Showdown IV) (Boss Mode)

Mega Man 4 (USA) (Rev A) [Hack by Insectduel v1.0] (~Megaman Showdown IV - Hard) (Boss Mode)