Want a fun way to tune up your brain? Why not use some classic mind games to help you increase your brainpower and get you out of your thinking "ruts." Good mind games habituate you to using creative problem solving as a normal part of thinking about things. One lateral thinking puzzle you can try right now involves nine dots, layed out three by three. You have to connect them all with four straight lines, and without lifting the pen or pencil from the paper. Figure this one out and you'll app.