"Please open the window."
Still wrong... considering this is an issue back from one year ago, I'm disappointed. Doubly so because while the Japanese do tend to use kanji less and less, the ones used in this sentence are very much commonplace... this is especially frustrating for someone like me who's studied Chinese for years and is used to characters. The very nature of kanjis makes memorizing vocabulary way easier than simply staring at kana. I hope duolingo will also realize this fact one day.