Can you build your own handheld game console?

Yes, you can build your own handheld game console, and a Raspberry Pi is the most common starting point for a DIY build. A typical project pairs a Raspberry Pi (or a smaller Pi Zero) with a small screen, a battery, some buttons, and a 3D-printed case, running software that plays games or emulators. Kits exist that bundle the parts, or you can source them separately and wire it yourself. It takes patience, basic soldering for some builds, and following a wiring guide, but it is a well-documented hobby with active communities. Dungeon Mastron has an experimental DIY console design along these lines for playing its story games, though that build is still in beta and not yet thoroughly tested on hardware.