I spent the past weekend trying to figure out what the name for a game was that I played before I even went to Primary school. The objective was quite simple: Move around, shoot little aliens that only poped up from the four corners of the playing field.
I can't desribe the game in detail (this was quite a while ago) All I can remember was that I played it as a kid when I was 4 / 5 years old, and it was number 1 on a blue 16-in-1 game cartridge with a little "pac-man" figure on the front. Also, it was a two-player only game.
Seeing as I don't have Photoshop in the office, this is the best I could come up with in MSPaint. The game screen used to look like the below picture.