Comment Elite - 1984, 3D open world (Score 4, Insightful) 228
Released in 1984 it was, to my knowledge, the very first 3D open world game. At a time when pacman and frogger were the "standard" it arrived featuring 3D graphics in a procedurally generated open world where you could be a trader, a pirate, a combat pilot, whatever you wished. All of this was done an 8bit machine with 32K of RAM including the OS and the video ram. It was truly revolutionary and an incredible technological feat.