Knoword - Expand Your Vocabulary

(from the website) Knoword is a fast-paced word game that challenges your vocabulary, tests your typing skills, and stimulates your mind. Loved by logophiles, students, and teachers alike, Knoword is sure to give your brain a good workout. Knoword is a great interactive exercise for the classroom. Play with your whole class on a projector or have students play in groups or individually on separate computers. It's a quick, fun way to practice English vocabulary and other subjects.
Link: Knoword - Expand Your Vocabulary