Vocabulary.com is a new free site from the creators of the “Visual Thesaurus.”
It’s a vocabulary game that has lots of bells and whistles, including the ability to evaluate how you’re doing and use that information to determine the difficulty of future questions. You have register first (it’s a pretty painless process) before you can use the site.
It’s probably not very useful to English Language Learners because of the lack of audio and the complexity of the sentences where it shows the words used in context. However, I am adding it to The Best Learning Games For Advanced ELL’s & Non-ELL’s.