Games are the candy of the computer world. No matter what reason one has for buying a computer, games are a welcome dividend. Computer games have progressed far from simple games such as pong, blackjack, and space invaders. Advanced adventure games involve elaborate plots and have graphics of extraordinary quality. Fast-action arcade games simulate everything from piloting a jet-fighter to exploring a dragon's lair in search of treasure. Others games are educational, introducing historical figures or mathematical principles.