If you have unlimited ammo (BulletsofHell) and two machineguns you can shoot non-stop. First you fire 15-25 bullets from the first gun you have then you start shooting the second one. Once you do that the one with half bullets will reload and fire again then the one with full ammo will reload and fire then while one is firing the other one will be reloading and so on. I hope it works for you like it did for me.
When you are in the bushes or trees and the guards don't spot you, wait to kill them. After a couple of minutes they should start talking to one another. Sometimes this can have helpful information but sometimes it's just yelling and cursing. Then after you have heard what you wanted or just needed a laugh from the non-stop action in this game aim and kill him whatever way you like. Also hiding in the bushes will increase your adrenaline, which you need for your feral ability. This game also has a "Directional Hearing" engine which means when looking directly at a nosiy object it will be louder than if you turned your head to the object.
You must have a silent gun, rocks and traps for this to work. Build a trap on a tree on "legs high" and one on "body high" then throw a rock at a guard and hide in the plants (KEEP LOW !) Just before the guard hits the trap stand up and shoot the lower trap--the trap throws the guard against the other trap and then he will be launched into the air! He'll fall and be smashed on the ground. Thats big fun!
In the first level, go until you come to your first enemy, where the game tells you to sneak up behind him and press the "B" button to kill him. You can sneak up behind him and throw rocks at his head, or other places on his body and he won't move! Its pretty funny.
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