Rez is a game that was initially released for the Playstation 2 and Dreamcast consoles, and re-released for Xbox360 and Playstation 3. It's a game in which the user is a computer hacker trying to stop a self-aware machine network from shutting down itself. Rez also revolves around the concept of synesthesia. To explain it simply, this game actually has music that change based on the way the user plays the game. For instance, there is a rhythmic beat that plays every time the user "shoots" at an evil program or virus. Every time the user progresses a stage within the level, the music changes slightly. Also, as the player levels up, their weapon changes slightly. All of these combine together in order to make an artistic experience for the person playing the game.
The art in this game is partially generative, since it is created and changes as the user progresses throughout the game. By another point of view, this art could be considered algorithmic, since it changes based on the way the player actually interacts with the game (meaning it will be different for each play through). All in all, Rez is a new age artistic experience that further explains how exactly a game can be considered a piece of art.