Computer Aided Learning (CAL) or Computer Based Learning (CBL)
"GBL would be best implemented in a classroom in the form of a fun, interactive program. Fortunately, such things already exist in today's society. Videogames are a strong base for GBL when used with children or young adults. Often, students are required to answer questions pertaining to subject matter correctly in order to advance in the game or to gain experience to defeat an enemy or achieve a goal. Many students have experienced playing videogames before, and something familiar often facilitates the learning process, as well as motivates the user to learn more so as to be better able to cope with new challenges in the game."
This article provides many useful hints and tips as well as links to educational and serious games.