4 links
CE's Metroid
algonet.se
Offers story, description of areas with maps, combat hints, enemies, items, weapons, and artwork.
GameWinners.com
gamewinners.com
Contains hints, cheat and Game Genie codes, walkthrough, controls, item list, enemies, and maps.
Metroid - Samus' Playground
members.aol.com
Covers original Metroid. Contains description of enemies, power-ups, background story, and codes.