基本玩法：
游戏内的每个关卡都是一个6*6的矩阵，每个矩阵包含两种不同建筑物，点击矩阵内的任意建筑物都会使其所在行列上的建筑物变成另外一种。
胜利条件：
将矩阵内的建筑物变成只有一种建筑物时即获得胜利。
How to play:
Each level in the game is a 6 * 6 matrix, and each matrix contains two different buildings. Clicking any building in the matrix will change the building on its row and column into another one.
Victory:
When the buildings in the matrix are changed into only one kind of buildings, the victory will be achieved.