Who Has The Biggest Brain? by Playfish is a cool app that allows you to compare your brain to that of your friends. It tests four different areas of your brain: Calculation, Memory, Logic, and Visual. Each of these areas is tested by playing mini games. There are 3 different types of mini games for each section making 12 mini games in all. To figure out your brain size, you are required to take a test that evaluates you by giving you one game in each of the 4 areas. You have 1 minute to complete each section.