Build your very own Arduino-based portable gaming toy with this kit from Tech Will Save Us!
The DIY Gamer Kit is an Arduino controlled gaming device. Once you solder the whole thing together, you'll have an 8x8 LED matrix display that serves as the device's screen. From there, just easily upload your game's code onto an Arduino (not included) and play! It's a great learning experience with a fun result.
The screen is just a small matrix, so you can't really play Assassin's Creed, but there are a lot of fun old school options you can set up like Snake or Tetris. You can follow some of their tutorials for even more. Adafruit set Adafruit'ss up to play a low rez Flappy Bird and had a great time.
To work the DIY Gamer Kit, you need an Arduino R3 and a 9V Battery. Both the Arduino and the 9V Battery are not included! You'll need to upload code to the Arduino so previous Arduino experience or willingness to explore is suggested