A while ago, I ordered a Meggy Jr RGB. It’s a kit you can put together to build a programmable handheld game device:
I’m building it tonight at Willoughby and Baltic, the hackerspace I’m a member of.
Once I get the hardware built, I’ll need to program a game for it. It’s basically what you see in the picture: an 8×8 RGB LED display, a d-pad, two other buttons, a tiny buzzer for a speaker, and a 1×8 array of single color status LEDs (for score, or number of lives, or whatever else).