This is a game which I played as a child, and you are likely to be familiar with, perhaps under a different name, such as Town and Country. I wonder, though, if you have played it in your language classes? I find that my students of all levels really like this game, and it is a useful way to round off a class, so that students leave ‘on a high’.
Put students in pairs and give them the instructions. Put 4–6 categories on the board in a grid, and ask them to copy it into their books. For an elementary class, these categories might work:
Give the letter, eg ‘P’. Put students in pairs and give them two minutes to think of one item starting with this letter, for each category. Tell them to try to think of an interesting, unusual example if possible because they will receive one point for an appropriate answer, but two points if their answer is unique. Do a practice run first. You will need to hear suggestions from each pair for one category in turn, eg country, then adjective. Students should keep their own scores. Make sure that students a) only write down ONE answer together, and that b) they do not change their answers as you are taking feedback!
This exercise can be used as a revision exercise of topic areas, eg if you have recently studied sport, clothes, personality adjectives / nouns, clothes, parts of the body, etc. Remember that some letters are likely to be much easier than others, eg S, P, T, and C are good ones, at least to start with.