Ranked in these QuestionsQuestion Ranking
Access to the whole site/program is completely free.
Pro Games focus on practicing the words you've struggled with
It remembers the words that you've scored poorly on in the past, and repeats these more often in games/tests than the words you know well.
Pro Five different games to choose from
Con Games do not end on their own
You have to decide when you've had enough playing the games, or set a timer. The games do not end the game for you, so it's not smart about conserving your energy or ending the session when you've learned the material or when you've gone beyond 25 minutes which is the limits of most people's ability to focus.