Interactive movie
An interactive movie, also known as Movie Game or VCR Game, is a video game that features highly cinematic presentation and heavy use of scripting, often through the use of full-motion video of either animated or live-action footage. In modern times, the term also refers to games that have a larger emphasis on story/presentation than on gameplay.
Design
This genre came about with the invention of laserdiscs and laserdisc players, the first nonlinear or random access video play devices. The fact that a laserdisc player could jump to and play any chapter instantaneously (rather than proceed in a linear path from start to finish like videotape) meant that games with branching plotlines could be constructed from out-of-order video chapters in much the same way as Choose Your Own Adventure books could be constructed from out-of-order pages, or the way an interactive film is constructed by choosing from a web of linked narratives.
Thus, interactive movies were animated or filmed with real actors like movies (or in some later cases, rendered with 3D models), and followed a main storyline. Alternative scenes were filmed to be triggered after wrong (or alternate allowable) actions of the player (such as 'Game Over' scenes).