One of the most popular free-to-play Tower Defense games ever created, The Battle Cats, is celebrating its 10th Anniversary starting this September and it's giving new players a chance to join in on the festivities and fun with some great rewards and incentives. Created by developer PONOS, The Battle Cats is a heavily strategic game in which players must deploy an array of truly bizarre cats in order to protect their base and destroy their enemy. It's an easy-to-play game that's challenging to master, with over 700 unique cat units that players can collect and deploy on this wacky journey through space and time.