Titles that fall under the 3D real-time strategy style feature 3D polygonal graphics and real-time action. This means that while you are building a base or mining minerals, the opponent could be organizing an attack at the same time. This style of game relies more on quick thinking and swift reflexes in order to manage everything as efficiently as possible. The 3D polygonal graphics allow for details such as varied terrain (including noticeable height differences with peaks and valleys) that would be hard to achieve using 2D graphics. The majority of real-time strategy games released after 1998 will fall under this style.