You have to pick an article, and then use the color-coded portions in it for vocabulary and grammar practice. When clicking on an item, you are given a question about the in-context grammar or vocabulary issue. You accumulate points and badges.
Newcomers to the site can take a level test. In addition, tips and activities are given to students.
Users must register either by using their email or their Facebook account, but the site is free.
H/T to Larry Ferlazzo.
