The Adjective Detective is a fun online game I just found out about from Technology & Learning. This game explains what an adjective is and provides a lot of interactive exercises siting examples. Also, it has students being a detective and finding the adjectives (i.e. superlative and comparative) by highlighting them in a sentence w/ a magnifying glass. Finally, there is a short quiz to help reinforce learning.
I recommend checking out The Adjective Detective by clicking here!!!