四人麻雀 -雀卓が回転する画期的「1人4役麻雀」で雀力UP! is a board game by 空想科学株式会社 with 1,000,000+ downloads (about 2.5M estimated). +191 installs in the last 7 days. Rated 4.8 from 21K ratings. Released Oct 26, 2013. Install growth, rank history, SDKs and ad networks.
From the store listing: “"Four Player Mahjong" is a full-fledged four-player mahjong game that even beginners can easily enjoy. Opponents include unique Sengoku warlords, a newly implemented "Beginner Mode" for solo mahjong, a convenient assist function to help beginners play, a wide variety of local rules and local roles to keep advanced…”