Billy Hatcher and the Giant Egg contains a feature called “Joycarry Games” similar to Animal Crossing’s NES game “Advance Play” feature. I wanted to extract the ROMs for these mini-games just like I did for Animal Crossing. Doing so wasn’t as straightforward; the ROMs aren’t available directly in the disc filesystem like they are in Animal Crossing. To extract the ROMs I ported an existing Rust program to Python (“rewrite-it-in-Python”, anyone?) that receives and saves the ROMs from the game running in Dolphin using the GBA TCP and Joyboot protocols.

These games are simple, and I only really played one as a kid: Puyo Pop. The game is similar to “Dr. Robotnik’s Mean Bean Machine”, which was a favorite of mine. This was the only way I could take that game “on-the-go”, often downloading the game to my GBA before road trips to see my grandparents.

Read more: https://sethmlarson.dev/extracting-billy-hatcher-joycarry-game-roms-with-python