Mixi's Marvel Tsum Tsumhas surpassed six million downloads since launching back in February 2016.
The game was originally released only in Japan at that time. It eventually began a push out to Western markets on August 31st.
In nine months it has achieved a tenth of the downloads of LINE's original Tsum Tsum game, Disney Tsum Tsum. Disney Tsum Tsum reached 60 million downloads in June 2016, 30 months after its initial release.
Disney chose to partner with Mixi over LINE for the new title because, according to Senior Producer Erika Nakamura, "they wanted to differentiate from the previous Tsum Tsum game by adding more excitement".
The game was first released in the US during the beginning of its Western push. It was a slightly surprising move given Mixi's decision to suspend advertising of its other popular title, Monster Strike, in the region.