I haven't played Cod in a while but I recently got into the mood. Mostly Zombies! I'm not actually going take photos of me playing, I'm just going to take photos from google and provide my knowledge along with it. Thanks add anything in the comments below!
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Step 1: Starting rounds
ok so when you first start, there are 2 methods in which you can use.
1. 3 or 4 shots with a pistol then a knife gets you maximum points
2. only knife which saves you ammo.
Personally I do #1 because usually you get a max ammo sooner or later
I always open the upstairs door because I find that way is better. Anyways, NEVER buy a gun on the wall in the begging rounds. after you buy 1-2 doors then you should buy a gun off the wall if you don't find a mystery box on your way. SO on first round it takes 1 knife to kill a zombie, then 2 knifes on round 2, 3 knifes on round 3 and so on. between round 3-5, you will want to buy a door.