Check out this DIY PacMan Mini Portable Gamer, pretty amazing how everything has been compacted to fit this little box.
-2.5” Intec game screen (CCFL Backlight)
-Uses a PCB taken from a Jakks Pacific – Namco TV Games
-Runs off 4x AA batteries (2.5 Hours Play)
-Charging port for when rechargeable batteries are used
-Power LED and reset button
-No sound support (maybe in the future)