Abstract: Disclosed are computer-implemented methods and systems for advertisement of products or services within electronic games, such as brain fitness games, games of skill, or development games. In general, these methods and systems enable incorporation of advertisement images or videos as a background and/or as a major subject of the electronic games. In an example, the method may comprise receiving a user request to initiate the electronic game for a user, providing a graphical interface of the electronic game, and providing, within the graphical interface, one or more graphical objects representing the product. The graphical objects may constitute at least one subject of the electronic game or be a background image or video.