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Inspired by Colossal Cave, Marc Blank and Dave Lebling created what was to become the first Infocom game, Zork, in 1977 at MIT's Laboratory for Computer Science.

Despite the development of a revolutionary virtual memory system that allowed games to be much larger than the average personal computer's normal capacity, the enormous mainframe-developed game had to be split into three roughly equal parts.

Zork I was released originally for the TRS-80 in 1980 and eventually sold more than a million copies across several platforms.

Even though Microsoft released a cheap version of Adventure with its initial version of MS-DOS 1. 0 for IBM PCs, Zork I was still a popular seller for the PC, thanks to the superior quality of its writing and packaging.