Assault City is one of those games that is comprised of a multitude of different mini-games that are all strung together by one common thread. In this game, the action doesn't change too much from round to round, but the different backgrounds and goals vary drastically as you make your way to the goal.
The game first tests your targeting abilities by presenting a grid of squares and quickly turning certain boxes to reveal good and bad targets. Depending on your initial performance, the game decides its difficulty. You proceed through automatically-scrolling backgrounds of bombed-out cities and ruins. Boss encounters feature static screens with extremely detailed robots and devices providing targets. Lots of shoot, shoot, shoot!