Metroid is the first game in the Metroid series, released for the FDS is Japan and then ported to NES.

• ASM patches/hacks
• ROM map and RAM map available on DataCrystal (these are rather incomplete)
• Disassembly of the entire game by Dirty McDingus, also available on RHDN. The version on this site may also include additional comments by metconsters. This is based on and extends the earlier disassembly of the core game engine code, released by SnowBro. The disassembly provides a more complete listing of RAM usage and ROM data but may be harder to interpret.

• Editroid (available on the Tools page)
• MetEdit
• Metroid Tuner

MetEdit includes a password generator/decoder, and there are a number of other standalone and online password generators/decoders available for Metroid.

• Doors in Metroid
• Pointers in Metroid
• Alternate Palettes Explained