Editing Zork (section)

===Sales===
Following its 1980 release, ''Zork{{spaces}}I'' became a bestseller from 1982 through 1985,<ref name="Bestseller"/> with 380,000 copies sold by 1986.<ref name="GSW2008"/> In its first nine months Personal Software sold 7,500 copies for the TRS-80 and Apple{{spaces}}II.{{refn|I.e., 1,500 copies of ''Zork{{spaces}}I'' for the TRS-80, and 6,000 copies for the Apple{{spaces}}II.<ref name="History3"/>}} Sales ballooned as Infocom began self-publishing the trilogy and the personal computer market expanded.<ref name="History3"/><ref name="GSW2008"/> ''Zork{{spaces}}I'' had sold 38,000 copies by the end of 1982, nearly 100,000 in 1983, and around 150,000 copies in 1984.<ref name="GSW2008"/> Its success outpaced Infocom's later games; ''[[Inc. (magazine)|Inc.]]'' reported in 1983 that ''Zork{{spaces}}I'', only one of Infocom's fifteen released titles, composed twenty percent of their annual sales.<ref name="Inc1983"/> ''Zork{{spaces}}I'' sales declined beginning in 1985. The second and third parts of ''Zork'' also sold well, though not as highly as the first: more than 170,000 ''Zork{{spaces}}II'' and 130,000 ''Zork{{spaces}}III'' copies sold by 1986.<ref name="GSW2008"/>

Overall sales of the first three episodes reached over 760,000 copies by early 1989.<ref name="GSW2008"/> Combined, they sold more than 250,000 copies by 1984,<ref name="Globe1984"/> and more than 680,000 copies through 1986, including the 1986 ''Zork Trilogy'' compilation release. Between 1982 and 1986, the ''Zork'' trilogy composed more than one-third of Infocom's two million total game sales. [[Activision]] purchased Infocom in 1986 and reported that the three ''Zork'' games and trilogy compilation sold another 80,000 copies by early 1989.<ref name="GSW2008"/><!--''GamePro'' claimed in 1993 that by then two million copies of the game in some form had been sold, but that likely includes other Zork games.<ref>{{cite magazine |title=Activision: Return to Zork |magazine=[[GamePro]] |date=August 1993 |issue=49 |page=16 |url=https://archive.org/details/GamePro_Issue_049_August_1993/page/n17}}</ref>-->