Super Mario World 2: Yoshi's Island (SNES) Disassembly

ActivePlayableSNES

Image of the original game, Yoshi's Island. This project has no screenshots of its own yet.

Yoshi's Island (original game, not this project) — Image of the original game, Yoshi's Island. This project has no screenshots of its own yet.

About

Super Mario World 2: Yoshi's Island is a 1995 SNES platform game in which Yoshi dinosaurs carry baby Mario across levels to reunite him with his brother Luigi, kidnapped by the wizard Kamek. This is a complete disassembly of Yoshi's Island's SNES code -- covering its 65816 CPU code, Super FX chip code, SPC-700 sound code, and data -- that reassembles under the asar assembler into a byte-for-byte match of the original US V1.0 ROM.

Getting started

Assemble the disassembly with the asar assembler to produce a playable ROM, then verify it matches the original by comparing its hash against a clean US V1.0 copy of the game.

Requires original assets. Requires a clean U 1.0 ROM to assemble; must verify output matches original via hash comparison.

Additional notes

Project status: Not all of the disassembled code is documented yet; the authors welcome contributions that label and explain more of it.