Only the current version so far — new entries appear as the app ships updates.
そろボード is an education app by SoroTouch Co., Ltd. with 5,000+ downloads (about 5.7K estimated). +12 installs in the last 7 days. Install growth, rank history, SDKs and ad networks.
From the store listing: “Free app for finger training in mental arithmetic learning "Sorotouch"”