Hi, so like many of you I've been teaching myself Japanese for a while and I figure I'd share one of resource I use.
Japanese Class.jp is essentially your normal memorization tests with a twist, you get points and level like an rpg making it quite addictive. Also the site has a helpful feature of tracking what you personally are weak at and with the exp system it's more encouraging to go over something you find difficult.
Learn Japanese Online: Vocabulary and Kanji Building - JapaneseClass.jp 
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