gt; gt; Free download for the first 3 days. lt; lt;Annual masterpiece from GxWorkgroup , the new 45-degree helical angle, real-time strategy (RTS) defense game.You will play the commander to protect the universe, deploy the defensive weapons, and control the building upgrades.Up to 20 defensive units for land, air fields, waiting for you to explore.Nearly 20 kinds of attack units, covering the areas of air, land, cannon, laser multi-arms. The version provides three worlds, a total of 60 levels.Game Center leaderboards and more than 50 achievements.If you are never afraid of new challenges, come to accept the new mission.---------Video:- iPadhttp://www.youtube.com/watch?v=aW13MllN_68http://v.youku.com/v_show/id_XMzA3MzMyNDQ4.html- Simulator (720p)http://www.youtube.com/watch?v=EOS1yRvsJNshttp://v.youku.com/v_show/id_XMzA3NDA0MjY4.html--------- Nadya