In Fisher, you have to match up the colors on the left column to match those on the right. If the left column has any combination of three, the fish will disappear and make more room. This means you can throw in a color that might not match the front fish because there is a column behind it that matches. Once you clear a column or row of fish, you get points and sometimes the fish stop moving towards you to give you extra time to shoot the fish over to the right spot. All the controls are in the mouse, moving up and down and clicking to shoot the fish across.