A Friendly Battle is a battle that can be initiated with one of the players in your Friends List. These battles are just for fun! They will not affect your trophy count or place on the Leaderboard. You can invite a player from your Friends List to battle by tapping on their name in the list. This will trigger a mini-popup where you can challenge them. If your friend is online, even better! Challenge them directly by tapping 'Challenge' beside their name.