Open world
There is no consensus on what the earliest open world game is, due to differing definitions of how large or open a world needs to be. Ars Technica traces the concept back to the free-roaming exploration of 1976 text adventure game "Colossal Cave Adventure", which inspired the free-roaming exploration of "Adventure" (1980), but notes that it wasn't until 1984 that what "we now know as open-world gaming" took on a "definite shape" with 1984 space simulator "Elite", considered a pioneer of the open world; Gamasutra argues that its open-ended sandbox style is rooted in flight simulators, such as SubLOGIC's "Flight Simulator" (1979/1980), noting most flight sims "offer a 'free flight' mode that allows players to simply pilot the aircraft and explore the virtual world". Others trace the concept back to 1981 CRPG "", which had a free-roaming overworld map inspired by tabletop RPG "Dungeons & Dragons". The overworld maps of the first five "Ultima" games, released up to 1988, lacked a single, unified scale, with towns and other places represented as icons; this style was adopted by the first three "Dragon Quest" games, released from 1986 to 1988 in Japan.
Hideo Kojima
After initial failed attempts to break into the video game industry, Kojima joined video game publisher Konami's MSX home computer division in 1986 as a designer and planner. Initially, he was disappointed with his assignment, and desired to work on Nintendo Entertainment System and arcade games instead—Kojima felt the color palette of the system was too restrictive. Kojima's gameplay ideas were often overlooked initially, and due to his lack of familiarity with programming was repeatedly snubbed for his failures in his initial years at Konami. At one point Kojima considered leaving the company, but he hung on. The first game he worked on was "Penguin Adventure", the sequel to "Antarctic Adventure", as an assistant director. It significantly expanded upon the gameplay of "Antarctic Adventure", adding more action game elements, a greater variety of levels, role-playing elements such as upgrading equipment, and multiple endings. The first game he developed was "Lost Warld" [sic], an MSX platform game in . However, the game was ultimately rejected by Kojima's superiors at Konami.