I spent time accessing sites for supplemental grammar exercises for my Basic Writing class at the university freshman level. I used this site extensively for its fun, educational exercises dealing with pronoun case, adjectives and adverbs, and modifiers. The materials were helpful for students as they contributed to what we had addressed in class. Their learning was enhanced because they liked using the computer and said the exercises were better than doing in-class worksheets.
Students found the site easy to get to and to navigate.