Vocabulary catch-up challenge

If you've spent too little time reviewing recently, this challenge is for you. I haven't spent much time reviewing lately and I'm more than 1000 reviews behind. The best way to kill a review queue is by persistent and regular time boxing, so let's do that! This challenge is a final test before the challenge engine goes public early next month, so it will only last until September 30th. If you have any comments or feedback, please contact me!