Start with a 'chat' either in rotating groups or in an interview format. This portion sets the level and focus of the game. A more advanced group might be told to talk to all their classmates about a certain topic, leaving the specific questions up to them. With a lower level group I find a note taking form to be useful. After the chat portion, do the 'who am I' game using your students' names.
Students practise grammar and syntax.
All levels, though better for more advanced students, because the game is more fun at a quick pace. One student begins a sentence by saying only one word. A second student must say a word which continues the sentence. A third must continue, and so on, until someone says a word that does not fit syntactically or grammatically. The teacher may suggest a topic to get things started.