Only the current version so far — new entries appear as the app ships updates.
Hiragana/Katakana Drills is an education app by Appicenter LLC with 50,000+ downloads (about 95K estimated). Rated 3.0 from 508 ratings. Install growth, rank history, SDKs and ad networks.
From the store listing: “Drill exercise for Japanese Hiragana/Katakana characters”