kanshudo.com/study/boost_first/grammar
Kanshudo Boost combines multiple learning modes including games and exercises to build and test knowledge of Japanese kanji, vocabulary, and grammar.
Apps and toolsGrammarVocabularySpaced repetitionJLPTGamesFreeHistoryKanaPitch accentIntermediateBeginnerQuizzesTextbooksSentence patternsJLPT N5