Where it comes from
Japanese-language article, 2013 GameBusiness.jp (reporting TPC release) · 18 October 2013 Open the original ↗
The line in the source
全世界で1545万本（2013年6月末時点）(15.45m worldwide as of end June 2013) Explore / Figure
Record
Lifetime worldwide (predecessor baseline), to date
15.5 million units To date
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.