There are new challenges that anyone can complete. The items you will get it a new pick axe, a new spray, a new dance, and a banner icon.
This link will show you how to complete these challenges: https://www.youtube.com/watch?v=OYWJArEZ_ug
These challenges weren't too hard. My son and I finished them today - took a small break from studying. I really needed a break. We played a few duos as well.
It would be cool to get a few members playing together on this.