- Prepare small pieces of paper each with either one thing students must do or one thing students must not do.
- Tell the students that they are supposed to form sentences that explain classroom rules.
- Divide the class into groups (of 4 if possible, so that everyone gets a chance to speak).
- Give each group the pieces of paper.
It's an easy game and the preparation does not take too much time. You can make as many rules as you wish.