Some misses...
I couldn’t find a contact for the developer so I hope they read the reviews. This app is good, but I found a mistake already in the N4 Kanji Quiz (100 questions). In a question where the kanji shown are clearly for jidousha, it marks the answer in hiragana for jidousha as incorrect and indicates that jitensha should have been selected. I hope that I do not find any other mistakes as I go through the other levels as I am going up one by one to refresh my memory and make sure that I haven’t forgotten any kanji before attempting to learn the N1 kanji.
