Tic tac toe is a classic game, but the standard version is pointless. It's far too easy to develop strategies that guarantee you'll draw or win. You can make the game more interesting by increasing the board size, but even that becomes too simple after a while. For a truly intriguing alternative version, you need to move on to higher dimensions (2D, 3D, 4D). In this class, you'll learn the basics of visualizing the fourth dimension through the lens of four-dimensional tic tac toe. You'll have the chance to verse other students in 3D and 4D games, and you'll even learn how to do so in your mind, without any pen or paper.