Description: Alien Invasion TD is a new strategy 3D game with an exciting new design, campaign mode, endless mode, players custom-built levels and PVP online multiplayer. The aim is to defend against waves of approaching enemies by placing and upgrading your defense towers, recruiting units and using special attacks and boosts. You will be challenged to reconsider your tactics and use different towers and heroes to complete the mission. Each mission has three levels of difficulty and two special modes with player handicap.