Metroid: Zero Mission

About

Your own cartridge, the one the metroidret decompilation rebuilds byte for byte, on mGBA compiled to WebAssembly, with save states.

The full story of Samus Aran's first mission finally unfolds... The first Metroid game just scratched the surface of the cataclysmic events on planet Zebes, and at long last the rest of the tale has come to light. Experience the first of Samus's legendary adventures through all-new cut-scenes and action sequences as the bounty hunter races through the deeps toward her showdown with the leader of the Space Pirates. But will the end of Mother Brain really mean the end of the story...? Completion of the game unlocks an emulated version of the original Metroid game. Zero Mission also allow players to unlock the Metroid Fusion picture gallery by linking between Zero Mission and Fusion cartridges via the Game Boy Advance Game Link Cable.

Description from IGDB.

How it runs

Project

mzmDecompilation. The original binary turned back into source code, function by function.By metroidretLicense: MIT

Port

andrewnakas.github.ioBy Andrew Nakas · WebAssembly, on the mGBA emulatorOnline since Oct 5, 2026Source: andrewnakas/mzm-web

Player

mGBA 2.5.1By Jeffrey Pfau (endrift) and contributors, built for the web by Nicholas VanCise (thenick775) · MPL-2.0Play opens it on this site. The port above is under Other ways to play.

Controls

Arrows move. X is A, Z is B, A is L, S is R, Enter is Start, Backspace is Select. Hold F to fast forward, R to rewind. On a touch screen, the buttons show on the screen.

Plays with

Keyboard and touch. Saves in your browser, with the moment you left.

You need

Your ROM: Metroid: Zero Mission (USA), .gba, 8 MiB. You pick the file in the player, which keeps it in your browser.

Original

Nintendo R&D1, 2004, Game Boy Advance