Adventure game
An adventure game is a video game in which the player assumes the role of a protagonist in an interactive story driven by exploration and puzzle-solving. The genre's focus on story allows it to draw heavily from other narrative-based media, literature and film, encompassing a wide variety of literary genres. Many adventure games (text and graphic) are designed for a single player, since this emphasis on story and character makes multi-player design difficult. "Colossal Cave Adventure" is identified as the first such adventure game, first released in 1976, while other notable adventure game series include "Zork", "King's Quest", "The Secret of Monkey Island", and "Myst".
Tennis for Two
"Tennis for Two" is considered under some definitions to be the first video game. Other candidates with stronger candidacies from a technological standpoint include the 1947 cathode-ray tube amusement device, the earliest known interactive electronic game, though it did not run on a computing device; the 1950 "Bertie the Brain", the earliest known game to run on a computer, though it used light bulbs for a display; and "OXO" and a draughts game by Christopher Strachey in 1952, the earliest digital computer games to display visuals on an electronic screen. "Tennis for Two", though it contained no technological developments to separate it from earlier games, has the distinction of being the earliest known computer game with visuals created purely for entertainment purposes. Prior games were created primarily for academic research purposes or to demonstrate the computing power of the underlying machine, with the exception of the non-computer based cathode-ray tube amusement device. This, therefore, makes "Tennis for Two" the first video game under some definitions from a philosophical viewpoint rather than a technical one and a distinctive moment in the early history of video games.