Metroid M
Original title: Metroid
Platform: Nintendo Entertainment System
Region: USA (Update Hacks)
Media: Cartridge
Controller: NES Gamepad
Genre: Platformer 
Gametype: Hack
Players: 1
Hacked by: Mega-Dog
Version: Patch
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This is a hack of Metroid that includes level changes and a modified palette.

http://www.zophar.net/hacks/nes/metroid-1/metroid-m.html