每一个关卡你将有越来越多的在圆圈里的元素去完成，所以你必须要加快速度来节省时间。
In each level you have to place an increasing number of parts into the circle, so you have to be quick or you run out of time.
每一个关卡都有新的武器出现，你要做的是如何利用好你的资源，卖掉那些旧武器，购买新武器或升级武器。
It is up to you, commander, how to spend the resources: restore and upgrade your veteran units or to purchase some new ones.
可以通过点击已经存在的层的名字右边的+按钮来创建新的层，记住，每一个关卡同一时刻只能被指定到一个层。
You can create new layers by clicking the + button to the right of the existing layer names. Each level can only be assigned to one layer at a time.
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