Here is another Raspberry Pi powered handheld gaming system that lets you play classic games anywhere. The MyPi Handheld Arcade Kit has a 5″ display and stereo sound. It comes with a preconfigured Micro SD card. You can connect the device to your TV too.
The kit comes with adapter board, DPad, speakers, USB board, 3D printed parts, Raspberry Pi 3 A+ and everything you need to get started.