The Sims is the first commercial product using
Pie Menus to sell more than 4 million units.
Pie Menus are a naturally efficient user interface technique: directional selection of pie slice shaped targets. The cursor starts out in the center of the pie, so all targets are large, nearby, and in different directions. Fitts' Law explains the advantages of pie menus, relating fast selection speed and low error rate to large target size and small distance. Pie menus are easy for novice users, who just follow the directions, and efficient for experienced users, who can quickly "mouse ahead" once they know the way.