In this multiplayer action/defense game, you build a clever fortress to protect a crystal from attackers. The fort will be attacked by other players or enemy waves. - Real players may drop into your fort and fight at anytime you play! - WATCH REPLAYS of any attacks that happened while you were away and use it to improve the layout! - TEAM UP with friends to bring down the toughest fortresses on the world wide top list! - Try your fortress against the 35 enemy waves to strengthen it and LEVEL UP - unlock new build elements! - Level up and CUSTOMIZE your character by defeating other fortresses or LOOT OUT STRONGHOLDS!