Feed the fish so it can grow and swim out to the ocean. There are two bars with fish food on either side of a Greater Than, Less than, or Equal sign. Select the bar which displays the correct sign for the difference in the food pieces. When you select the correct bar the food will drop and the fish will eat and grow. If you are incorrect after the first level the fish will shrink. After 8 levels the fish will be full grown and swim out to sea.