Here is a complete level hack for Rock Man IV. All levels have been changed. This patch is meant for applying to the Rockman 4 - Aratanaru Yabou!!. Apply to a Mega Man IV English ROM at your own risk.
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Rockman 4 - Aratanaru Yabou!! (Japan).nes - NOINTRO
CRC32: 771A9138
MD5: 8B4B65D68DEDC70A537505BDA430DAE9
SHA-1: C33C6FA5B0A5B010AF6B38CBD22252A595500A5A
SHA-256: AB4EB162A7BC84A317939B3F952314C9C7D0E6B7065210FF39322A3A13AEAA4C