The only way you can use the death cards is to have a private match, so if you planned on having a match with two controls guest style, you can't. You can invite people to the game, but I experienced that they have to be a Gold Membership. Sorry, but they will work. *Also note that you can't play a private match alone!!!
yes
No, they can only work on Co-op
no
edit; go to youtube it shows you but i dont know why it doesnt work on mine but a lot off people tell me eht works so .....
No. There used to be a glitch so they would work, but treyarch patched it so it doesnt work anymore.
There were a quite a few zombie glitches, but the majority of them got patched.(basically they stop you from doing them). There are a few still but they aren't as good and i dont know them, search them on youtube and you will see the ones that still work
co-op missions they work in (says in manual)
Umm you post a question on a Q&A website and don't expect an honest answer?
well i dont really know ive found about 11 of them on ghoul bodies but dont really work maybe see this at fallout wiki the pass cards are references to doom and have no use except selling
It will work depending on what card.
No, only US cards work on US and ES Cards only on ES =]
yes all games work on edge cards