Fortress defense warfare invincible version, enough to buy and upgrade are free of charge, special forces to unlock the special forces will not die in four waves. Hot red land, our military base is stationed here, the enemy struck the headquarters command you to be beyond the Great Wall sniper enemy, enemy-man attack force is not strong, but there are a lot, you have to play Sniper advantages, they are killed to protect the base. Ready? The enemy has begun to attack.