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".
Nimrod (computer)
The Nimrod was created only four years after the 1947 invention of the cathode-ray tube amusement device, the earliest known interactive electronic game, and one year after a similar purpose built game-playing machine, "Bertie the Brain", the first computer-based game to feature a visual display of any sort. The Nimrod is considered under some definitions one of the first video games, possibly the second. While definitions vary, the prior cathode-ray tube amusement device was a purely analog electrical game, and while the Nimrod and "Bertie" did not feature an electronic screen they both had a game running on a computer. The software-based tic-tac-toe game "OXO" and a draughts program by Christopher Strachey were programmed a year later in 1952 and were the first computer games to display visuals on an electronic screen rather than through light bulbs.