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In page Interactive fiction:

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In early 1977, Adventure spread across ARPAnet, and has survived on the Internet to this day. The game has since been ported to many other operating systems, and was included with the floppy-disk distribution of Microsoft's MS-DOS 1.0 OS. Adventure is a cornerstone of the online IF community;[citation needed] there currently exist dozens of different independently programmed versions, with additional elements, such as new rooms or puzzles, and various scoring systems.