Game Boy Zero with custom SD card reader game cartridge

UPDATE: I set up a blog where I’ll be posting how-to guides for this project. You can also enter there for a chance to win the one I’ll be building! I made a RetroPie handheld using a Raspberry Pi Zero and an original DMG-01 Game Boy. I modified an original Game Boy cartridge to act as an SD card adaptor for the Pi, so I can have the same satisfaction of putting a cartridge in and powering it on like you would on a regular Game Boy. :) Some pictures of the build are here: https: