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In page Quake II:

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Quake II entered PC Data's monthly computer game sales rankings at #2 for December 1997, behind Riven.[1] The game's sales in the United States alone reached 240,913 copies by the end of 1997,[2] after its release on December 9.[citation needed] According to PC Data, it was the country's 22nd-best-selling computer game of 1997.[2] The following year, Quake II secured fifth place on PC Data's charts for January and February 1998,[3][4] then dropped to #8 in March and #9 in April.[4][5] It remained in PC Data's top 20 for another two months,[6] before exiting in July 1998.[7] Quake II surpassed 850,000 units shipped to retailers by April 1998,[8] and 900,000 by June.[9]