Ideal if you can do this on a whiteboard where you will stand with a group of people. Talk about what classes you think you will need if you are going to program a Dam game. Try together to get to a good end result.
When you have figured out all the classes, then think about what exactly you would call those classes: write those names down. Remember that also the current state of the game must be stored in objects.
Please note the following for this challenge: