Here is a well done ROM hack which changes all the levels up to the third Dr. Wily (Boss Rush) level, enemy patterns & also the stage graphics.
Please be sure to apply patch to Rockman 4 and not the Mega Man IV.
Fourth Dr. Cossack level is still in production.
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rock5easily????̃G?f?B?^&?u?`?b?v?????ɔw?i?ɉB????lj??v?u?X?N???[?????????v
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http://www.geocities.jp/rock5easily/
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?[?@Neo?ڂ낭???H?[?@??
http://sldnoonmoon.hp.infoseek.co.jp/
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?[?@Insectduel's Domain - Rondell L. Mole's ROM Remodeling Site?@??
https://sites.google.com/site/insectduel/
Rockman 4 - Aratanaru Yabou!! (Japan).nes
CRC32: 771A9138
MD5: 8B4B65D68DEDC70A537505BDA430DAE9
SHA-1: C33C6FA5B0A5B010AF6B38CBD22252A595500A5A
SHA-256: AB4EB162A7BC84A317939B3F952314C9C7D0E6B7065210FF39322A3A13AEAA4C