The Idiom Connection

This website focuses on how idioms work. According to the author "an idiom is a combination of words that has a meaning that is different from the meanings of the individual words themselves". It has an A-Z list of idioms and the respective quizzes to test your knowledge. It's desirable to know by heart at least the "100 Most Frequently Used English Idioms". Time to hit the books! Link

Cambridge - Connect Arcade

Connect is a multi-skills english series for teenagers. Here you'll find creative activities and educational games for all the four levels (beginner, high beginner, intermediate and high intermediate). It is divided into high-interest topics. This ready-to-use material  is a support component from Cambridge. You can practice grammar, listening and vocabulary with fun animations. Connect and have online fun. Link