A Single Screen game perspective can apply to all video games in which the entire playfield is shown on the screen, and the player character is unable to move beyond the boundaries of the screen either to a) scroll the game world (e.g Mappy), or b) move to a different screen (e.g Berzerk). It is not to be confused with the diorama perspective, which refers to non-screen based games (shooting galleries, pinball and other mechanical games) which were popular before and during the early years of video games. Also not to be confused with hybrid perspective games such as Caveman (Gottlieb), and Boot Hill (Midway), which because of their dual camera nature are harder to classify into one perspective.