The game was inspired by Colossal Adventure. The first version was released in 1977, and work continued until 1979. Along the way, the game changed name from Dungeon to Zork to avoid copyright issues with a certain RPG company.
This game later formed the basis of Zork I-III, but the latter two in particular were greatly extended.
Read the detailed (and very entertaining) story about the game's creation.
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