StudyWard is a Japanese language studying tool. There are a variety of game modes each with their own settings meant to test a user's comprehension. The site is best used as a supplement to your other learning materials to gauge how well you've absorbed the information.
StudyWard is primarily maintained by Jason with ideas and consultation from Legs.
Sources
JMDict
Used for translations, definitions, part-of-speech categorization, and as a general source of truth. A huge thanks to Dmitry Shpika for simplifying its usage.
Jonathan Waller's JLPT Vocabulary Lists
Used for creating word pairings and JLPT NLevel categorization. Thank you to Isak Mikalsen for reformatting.