The Mega Drive squished into a single chip and put on a keychain. This might be the best thing Atgames ever made. I guess it's easier to forgive sluggish gameplay and horrific sound when it comes in the form of a cute arcade joystick. And the title game is a glitched out mess, too. So well done, atgames.
I've collected a few other variants, too:
Columns version (my personal favourite).
Sonic 1 & 2 version (unlike the others, this only contains original Mega Drive games and as far as I know, was sold exclusively by UK retailer Argos).
For more info, visit this link.
Guess I can tick owning a Space Invaders cabinet off the bucket list now... More of a novelty than truly playable, if I'm honest. Putting your keys on it would only scratch the screen and while it's fun in short bursts, hand cramp is likely to defeat you quicker than any advancing aliens. I plan to do the mod with a 4 way dip switch and unlock the other three games.
A Frogger variant I found in a bargain bin for £3. Score!