With this worksheet the concept of an adverb (in contrast to the concept of an adjective) can be easily introduced. First, the students have to put sentences into the correct category (adverb or adjective) and come up with their own rule when to use what. Then, they read a text about a vampire and have to find all adverbs and adjectives, respectively. Finally, they need to write some sentences. 

You want a more game-based approach? Here's a PowerPoint with which the notion of an adverb can easily be introduced or revised.