World War 2 Defense

This is the one with the theme of the second world war the policy class tower anti game. You need to decorate the road on both sides of the defense forces, prevent the attack of the enemy, each kill an enemy can get money, each defensive troops can also damage, range, the strengthening of the firing rate, after pass can also buy new > > >. Tower anti fan, world war ii the control to try to hurry up!

explain：

Each pass a level can gain experience points, can use the experience points to upgrade weapons and unlock levels, not to need to pass additional purchase

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