Metroid Remix
Original title: Metroid
Platform: Nintendo Entertainment System
Region: USA (Update Hacks)
Media: Cartridge
Controller: NES Gamepad
Genre: Platformer 
Gametype: Hack
Release Year: 2000
Players: 1
Hacked by: Litmus Dragon
Version: 1.3
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This is a hack for Metroid. It improves the challenge level of the game considerably and alters the location of items and monsters. It also alters the layout of several areas in the game.

http://www.romhacking.net/hacks/63/