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XTL , 5 hours ago en.wikipedia.org/wiki/Hunter_(video_game) en.wikipedia.org/wiki/Elite_(video_game) en.wikipedia.org/wiki/Angband_(video_game) Depends on how you constrain that idea. Open worlds were a very early idea, but old computers were somewhat capacity limited in how much content you could have.
en.wikipedia.org/wiki/Hunter_(video_game)
en.wikipedia.org/wiki/Elite_(video_game)
en.wikipedia.org/wiki/Angband_(video_game)
Depends on how you constrain that idea. Open worlds were a very early idea, but old computers were somewhat capacity limited in how much content you could have.