Your frog is fixed on a position and can only rotate on its axis. Before this happens, you have to eliminate the slowly-moving balls by completing sets of three or more from your trusty ball-spitting frog. At the end of this path is a sacred golden skull, and once the balls reach this skull, it’s game over for you. Each level has a clearly defined path through which a series of balls pass through.
The basic objective of Zuma is to complete levels by making all the balls explode.