Version 3.0
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As long as I have been here, I have never seen an introductory game or system have a sales increase from the previous month whether it was only tracked for 1 day or 31 days in it's debut month. ( or week in MC threads ) I'm not saying it hasn't happened, but I can't recall an occurrence of it happening
It happens, but very, very rarely. If I recall, Mario Party on the Wii managed to do it. The Wii, DS and PS3 went up month 2, but they launched in November, so the Christmas bump put them over the top. Even then it's no guarantee: the Xbox, Gamecube and 360 all launched in Nov and hardware sales still fell in Dec.