Defenders 2: Tower Defense CCG is a multiplayer game in the genre of Tower Defense. It's a game about a battle for the Castle, where two teams fight against each other. The first team is made up of heroes who will defend the kingdom, and the other is the "Touched" team made up of zombies, goblins, and aliens. 

The game starts with the heroes building their defenses. They need to protect the Citizens of the Kingdom. You will need to help them save them from the enemies.

The game starts with a couple of missions that are unlocked by completing them. There are more missions that can be unlocked as you play. The goal is to stop the Touched team from reaching the Castle. The players build their own defense, and attack is the only way to win the battle. 

They can also use other elements such as fire and lightning. The game is about strategy, not just building. It's all about finding the best way to protect your land.