I had this wrist watch game from Armitron - Saturn 1:
This was a great game that involved moving your ship zig zag across the screen from left to right while avoiding being hit by the enemy UFOs. I was very lucky to come across this on Ebay a few years ago but have yet to see another one. And I have no idea what ever happened to my original one.
I also wanted the Pac Man watch but never got one, although lots of my friends had them.
Casio also had a few game watches that were pretty cool too. Anyone else have one of these or still have one? Post your photos.