Where it comes from
The line in the source
初週販売本数は255万本と、ニンテンドーDSソフト史上最速最多の滑り出しとなりました。 In English
First-week sales were 2.55m units, the fastest and largest launch of any Nintendo DS software.
Explore / Figure
Record
Black white first week units, Sep 18–24, 2010
2.55 millions of units Sep 18–24, 2010
ReportedReported by a reliable secondary source, or read carefully from filed documents.
Found in one pass only. The research team reads every source twice, independently; this record turned up in one reading but not the other, so treat it as less certain than its grade.