Which characteristics can a video game have? Many of them. First of all, the graphics, which can be in 2D or 3D. They go from vectors, 2D and 3D cartoons, to hyper-realistic 3D images. This realism degree is very important in 3D-graphics games, because they give the game the necessary immersion degree. We can see three different examples of the two-dimensional platform game with a very simple structure; going then to a more three-dimensional game, also inside the platforms genre but with a more fantastic image; and then we finally have God of Wars 3, which is a more realistic game with very realistic people and highly realistic motions. Another important video games characteristic is the animation part, that is the characters' movements, which can go from highly realistic, such as the sports video games, in which the players' movements have been captured by high-precision devices, or more fantastic and cartoon-like motions. if our art style is more artistic or more cartoonish. Sound and special effects are also an important part of the player's immersion, as the more realistic the sound is, the closer the player feels to the situation. There is also a 3D sound idea, in which sound points the player where the different objects are placed in a three-dimensional space. Platforms are nowadays very important when creating a video game, as the platform is the place where the game will be executed and tested. There are three basic kinds of platform: The video game consoles, which are a very specialized hardware in the video games field, in graphic, audio and image quality level. There are a few models on the market. On the other hand we have personal computers, which are computers with no specific purposes but during the last years have gained a lot of graphics capacity and can run high-quality graphics games. And during the last years, the appearance of the cell phones or smart phones, has given another platform option more accessible to everybody and which, during the last years, have evolved both at graphics and processing level. This has allowed cell phones to become a gaming platform, whose quality keeps improving. At the moment, they haven't achieved the high quality game consoles and computers have right now, but if they keep evolving they most probably will. It is also true that the appearance of video games in cell phones has made possible the creation of video games less focused on the high-quality graphics and more focused on the concept of originality and innovation in the part of the game's design. That way, small group works have created cell phone video games with a high success rate. Their price is also one of the most important characteristics when speaking about those games. They are in a really wide price range, with more expensive or cheap prices depending on the complexity of the video game and its creation process. In the beginning, years ago, it was usual, specially in console video games, the purchase of games in DVD format, so the whole game was inside the DVD. Nowadays, thanks to Internet's appearance and the possibility of connecting all those video consoles and computers, allows us to download a part of the game from the Internet at a low cost, even for free, and any expansion, any property we can add to it, whether they are new features, new characters, etc. can be achieved, can be bought in aim to keep playing or getting to higher levels. This gives place to a more constant business model, and assists in the games' evolution, setting away the closed code games from before. Interaction is one of the things that has recently improved a lot. Going from contact devices such as any controller with buttons and little joysticks to contactless devices such as Kinect, Leap Motion or augmented reality technologies, in which the player doesn't need to know how the commands work inside the game, he only needs movements either from the hands or the whole body. Even in augmented reality systems, through some marks, they can achieve a more agile interaction with the video game. This is one of the trends lately being promoted inside the video games world. The appearance of Internet also allows a socialization using the video games' resources, the online games allow cooperative games in which different players have to communicate. An important point is that we must take into account in video games is their rating, what range of age is the recommended one for the video game. There's a code, called PEGI, which is an orientation mechanism on the suitable age of those games, that video game industry has established, and tells us the age ranges in which playing is recommended, which are from 3, 6, 12, 16 or 18 years old on. They also are tagged with the sensitive information the game has, or the topics we may find in it, such as bad language, discrimination, use of drugs, etcetera, so this way the future player will know about the video game contents, and at what age it is suitable, or even playable.