If you are referring to upgraded ammo, as in when you see upgraded Ammo on the walls, then.
Upgraged Ammo is simply ammo for a Pack-A-Puched Weapon.
For example, the MP40 has ammo that cost 500 points, when Pack-A-Punched, it will cost 4500 points to replenish the ammo.
if you pack a punch a weapon that you bought off the wall you can buy ammo for the upgraded version. but only when it is upgraded
keep moving, don't let the zombies corner, make sure to always have a full mag, try your luck at the mystery boxes, knife zombies at the beginning, conserve ammo, play co-op
You can't... But Online and Nazis zombies is co-op. :D
There is no co-op mode like Modern Warfare 2's Spec-Ops mode In Black ops, the Zombies mode is considered as the co-op mode.
zombies is a story line from callof duty world at war. then to black op. also look for the story line on google.com/
you cant upgrade it twice
You don't. The only thing close to co-op campaign, is Nazi Zombies.
there ain't any i have the action replay so don't buy one
there is co-op online multiplayer, zombies, bots(online)
it depend sif your playing black ops zombies or world at war zombies black op zombies has stamin up double tap and PhD flopper regular world at war zombies has speed cola jugger nog and quick revive
you first need to get enough of points to upgrade your gun. It cost 5000 points to get your gun upgraded, to me I try and upgrade my gun as early as I can so I dont have alot of trouble later on. The best guns to be upgraded would be the Ray gun, Thunder gun, Hk21, or the RPK. I hope this would help you get to higher rounds iv only gotten to round 18 but i hope this helps you.
OK. I don't know your exact question, but I can still answer it. To get infinite ammo beat the game and have a fully upgraded weapon. Go to bonus features and buy infinite ammo. Then go to special features and turn Infinte ammo on. There you go!
Yes. You can play Co-Op splitscreen in the Online mode and the Zombies Mode but not on the Campaign mode