Here is a guide
To anyone who finds this game hard heres a guide.
Finish the first stage if your barricade has reached down to 80 fix it up till 85-90 if it got lower try again. Then go spend 4-6 hours on survivors same with weapons. Repeat that pattern and don't over repair the barricade.Hints: Any searching could lose a survivor, Even though it seems you have all weapons there is one more after the AK-47 search again till you have it,Have a auto weapon and the hunting rifle as your second its usually a 1 hit kill,There is only 20 stages,When you face soldiers or SWAT members aim for the head or legs they wont be affected by body shots The ultimate weapon is one hit kill and go through multiple enemies,Try to aim for the heads,Some times enemies run at you,Shotgun takes a lot of time to reload sawed off is quicker,The more survivors you have the faster you can rebuild your barricade and the easier it is to find survivors.