Where it comes from
The line in the source
グループ交換は最大20人までのグループを作ってグループ内でランダムに交換する機能。 [Group trade: groups of up to 20 trade randomly within the group] Explore / Figure
Record
Group size up to 20, random trades in group, February 2020 launch
up to 20 February 2020 launch
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.