Rockman 2000
Original title: Rockman
Platform: Nintendo Entertainment System
Region: USA (Update Hacks)
Media: Cartridge
Controller: NES Gamepad
Genre: Platformer 
Gametype: Hack
Release Year: 2001
Players: 1
Hacked by: Kuwata
Version: 1.0
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Kuwata's first hack of Rockman. It features new levels, graphics, enemies, and even music. The levels are very challenging; some even have small puzzles in them.

http://www.romhacking.net/hacks/98/