There’s lots of retro projects out there – you’ll have seen a lot of them on this blog before! Here’s another! 🙂
Zach has taken an NES cartridge (Back to the Future… because it’s not very good!), ripped the guts out and installed a Raspberry Pi Zero inside. He’s added a USB hub so he can attach multiple game controllers and then used a 2A power supply so everything has enough power. He’s then packed the Zero’s SD card with lots of retro games via RetroPie. He’s documented the whole procedure on howchoo.com.