Fort Defenders Saga TD 海堡守卫 v1.1.3

Now the battle rages on by land and by sea absolutely free! Pirate armada dead ahead! Play this strategical defense game and take part in an uncompromising struggle repelling freebooters' assaults. Each level brings new units and structures to help you fight the pirate menace. Build towers, save money, learn spells, and keep the enemy away! Master the tactics of magic and arms!
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http://itunes.apple.com/cn/app/id689135653