a picture of a girl. Money Idol Exchanger is a puzzle game comparable to the Magical Drop series (which is also categorized as a bishōjo game). In some cases, images of girls are used as prizes for skilled play, as is the case in strip Mahjong. In other games, the bishōjo aspect can be integrated more tightly into the game: in most dating sims, the objective is to select the correct conversation lines while speaking with a female character to increase their "love meter". This type of game resembles role-playing or adventure games. Many are very linear and are essentially interactive romance novels for men (sometimes called visual novels). Most bishōjo games remain 2D. The main reason is that bishōjo games are centered mainly on characters instead of landscapes, and for this intention, 2D bitmaps continue to look better than 3D models (which tend to be blocky when seen up close). The main advantage of 3D models in this context is smoother and more realistic animation, although this is usually discarded by the unpolished look of the 3D characters, in addition to the additional cost of production for this type of work. Tokimeki Memorial 3 (2001) was the first bishōjo game to have all its characters modeled in 3D, although the sales were smaller than hoped, perhaps discouraging other developers from the possibility of changing bishōjo games from 2D to 3D. Many bishōjo games nowadays are essentially a slideshow of 2D pictures plus voice and text. Pornographic content While there are a number of bishōjo games entirely focused on hardcore pornography, many of the most popular titles, including all those available for home video consoles, do not contain pornographic material, and many others only contain a small amount in relation to the story as a whole. For example, the 18+ version of the popular game Kanon contains a total of five sex scenes and two other images of nudity within a branched story the size of a long novel. The pornographic content of bishōjo games is regulated by the Ethics Organization of Computer Software (EOCS), the organization in charge of classifying the content of video games in the Japanese industry. Pornography is prohibited in all console titles, and computer games are assigned a special classification alerting the public to its content. Also, as in all legal Japanese pornography, the explicit images are normally censored, showing mosaics or bars on the