ColourDi is a game designed to assess eye hand coordination capabilities. Users are directed to track and select circuluar targets of varying size and colour. Target motion is randomized and utilizes rudimentary 2-D physics. Program output details an array of data, including "time to target" (a timed navigation component) and "accuracy-of-selection" totals. It is one of several programs that when utilized together comprise the ColourS program package - a more extensive set of simple games designed to assess and train eye hand coordination skills. To learn more about the ColourS package, please refer to the repository for details on how to download and use the program.