Attention should be paid when the purchase of firearms with bullets, bullets of specifications are not used up or will not be able to attack. In addition the beginning of each day to buy defense barrier, the right side of the screen most of the obstructions on the option, players can take advantage of. Instructions WASD keys or the arrow keys control the movement of the mouse aim and shoot E key: obstacles and repair, I key: backpack, Shift key: running, the number keys 1-4: Select weapons.