Metroid Fusion is the fourth game in the Metroid series, released for the GBA in 2002.

All information relates to the specific ROM: “Metroid Fusion (U) [!].gba”, it has CRC 6C75479C, sha1 CA33F4348C2C05DD330D37B97E2C5A69531DFE87 and internal name “METROID4USA”. ROM size is 8,388,608 bytes.

If you do not know how to verify your ROM's checksum, try opening the ROM in an emulator or use something like QuickHash or Microsoft's Checksum Tool.

• MAGE - Metroid Advance Game Editor
• Double Helix 1.0 (Obsolete)
• Double Helix 2.0 (WIP)

A list of guides created by the community, from manuals on the tools themselves to advanced guides relating to ASM, its all here.

Manuals of the workings of all the editors and utilities available to you, detailing all their functions.

• MAGE - Guide to editing with MAGE, written by OneOf99 read all about its functions here.
• Double Helix - The now deprecated editor for Metroid Zero Mission, read all about its functions here.

These guides cover all the basic things around editing Metroid Fusion, as well as serving as a good starting point for learning how to get into Metroid Fusion hacking!

• FAQ - Some answers to frequently asked questions in gbatroid hacking. If this doesn't help, remember to read the MAGE docs.

These guides assume you have a good basic knowledge about editing Metroid Fusion already, you should probably be comfortable with using Double Helix by now and be moving onto using tools like a hex editor.

• Intermediate Guide - Intermediate Guide

These guides could be pretty complex, you should probably be comfortable with assembly by now.

• Expert Guide - Expert Guide

This segment is reserved for technical information on Metroid Fusion, to be used as reference material for hackers, or for the curious wanting to know what makes Samus tick, or possibly you are interested in making a fan game and want to know how Metroid Fusion does things!

• MF Graphics Data Map
• MF Clipdata List - A list of clipdata and their behavior
• MF RAM Map
• MF ROM Code Map
• MF ROM Data Map
• MF Sprite AI Map
• MF Voicegroup Map
• MF Event List
• MF Sprite List

• Generic BG Graphics - Graphical / Address map of things in Generic BG
• Samus Palettes - Locations of Samus Palettes
• Map Graphics - Locations of Map and Minimap Graphics / Palettes (Incomplete!)

• RNG Info - How RNG is calculated in Fusion
• Hex Changes

• Structures of objects in fusion.
• Variables in fusion.
• Functions in fusion.