The Sky Kingdom is under siege. Build towers, collect 50 artifacts, defeat 15 bosses in this amazing Tower Defense 3D game.Play on 5 perfectly balanced tower defense maps, where each one requires a strategy to win. Defeat bosses and grab powerful artifacts, replay levels to get more from each boss. Defend the Sky Kingdom from enemies which rush between portals in attempt to raid the Crystal Gardens. Beat all tower defense maps, defeat waves of enemies and win 3 stars when no one has escaped your wrath.