Hillary Clinton’s campaign launched a mobile app on Sunday to make campaign organizing easier.  

The Clinton campaign said the app is centered around what it calls a “virtual campaign field office” and said it took the best experiences from gaming applications.  

The app includes daily challenges like quizzes on policy and allows them to get real-world signed merchandise from the Clinton campaign. It also allows users to compete against friends.  

The app comes as many Republicans have been concerned about nominee Donald Trump campaign’s weak  ground game.