A repeat of the must/mustn’t game I mentioned a while back. I used this for should/shouldn’t the other day, in the context of illness.
Choose an illness, or some kind of problem related to your context. Prepare three pieces of advice, keep them hidden. Students work in pairs/groups and write down as much advice as they can using ‘you should/shouldn’t’. Allow a few minutes. Reveal your answers. If students’ ideas match the advice on the board (or it’s close enough) they get points.
Always seems to be fun and engaging. Let me know if it works for you.