The use of digital games for the promotion of goods and services is becoming more popular with the maturing and penetration of the medium. This chapter analyzes the use of advertisement in games and seeks to answer in which way brands are integrated in interactive play. The branding of virtual worlds offers a completely new range of opportunities for advertisers to create a web of brands, and it is the usage of marketing through games that differs considerably. This chapter offers a categorization of advergames and will address the use of advergames from a developmental perspective, differing between commercial games with in-game advertisement and dedicated advergames. Where TV commercials, print ads, and the World Wide Web rely on representation for the conveying of their message, advergames are able to add the extra dimension of simulation as a mode of representation, resulting in various interesting game designs.