Move your fish around the screen using your mouse. You start out as a small fry, but will quickly grow in size as you eat more and more fish. Make sure to look at your Food Chain meter to figure out what's OK for you to eat!

If you try to eat a fish that's bigger than you are, you get eaten yourself. Do this too many times and it's game over.

As you advance through the game, new options and powers become available to you. Pay attention to the in-game help screens to learn more about what your fish can do.