As players draw a card with pictures of four fish, the goal is to match the fish cards and place them on the play grid. The images must match by color and by direction in which they swim. Cards must be played so the exact image matches touch. The first player to get to 10 points wins.

Young testers learned how to look for ways to build on a matching series another player had started, (an clever way to get 6 or 7 fish in a series at once) or to figure out how to get double the points by finding a card that lines up with two kinds of fish.