iPhone Giveaway of the Day - 17 City Defense HD

Expanding the borders of conventional RTS games, 17cityTD2 requires the most coordination of strategic and tactical in military operations.
The level design is based on Articles of Sun Tru′s 《The Art of War》. Different from the traditional repeating of building towers in TD game, 17cityTD2 needs the player to consider more about mining/obstacles/terrain/the explode interval of atomic bomb/aerial battle, etc.
Now this fantastic game is stocking up for launch.
Are you ready to kick off?

New features:
1.Add two super weapons: meteoric falling and atomic bomb which make the battle more fierce.
2.Add new explode effects for geomagnetic storm/missile/ice cubes.
3.Add different death effects for different monsters.
4.Redesign of game sounds: add new sound effect for explode and background music.
5.Adjust the difficulty of levels in order that the players can get more achievement of satisfaction.

Walkthrough
一:步步为营:Step after step the ladder is ascended.
二:一夫当关:Hold the central path, speed up your mining.
三:背水一战:Lure the enemy away the river into the plain.
四:釜底抽薪:Explode the huge ore using atomic bomb.
五:调虎离山:Guard the three island, extend the way of the big boss.
六:暗渡陈仓:Watch out the obstacle in this map, which may be a fraud!
七:围城打援:Guard the minerals, coordinate mining and attacking.
八:以静制动:Delaying tactic by wisely using the big iron pillars.
九:十面埋伏:First of all, dispose the iron pillars which make the battle field in to four pieces.
十:欲擒故纵:Pay attention to the flying monster, that is the real big boss.