Area 51 Defense is the most beautiful sci-fi tower defense game available on iOS. You can play campaign or try your skills in survival more. Whatever you chose, beautiful HD graphics, immense action and smooth gameplay will give you hours of enjoyment! FEATURES: ? Campaign with 51 unique missions ? Survival mode on 17 cool maps ? 14 types of deadly enemies ? 5 types of towers with 12 upgrades per tower ? Each tower has it's own special ability Area 51 Defense is a mature version of Epic War TD, game enjoyed by more than 2,500,000 players all over the world!