no you just need the one you want to use
13
yes there is ;)
no its stupid
Private online matches...
no
No it realy sucks but no there arent
You get an achievement/trophy.
there are no death cards in the Wii version i own it to and there is no nazi zombie mode ether
You can activate them in a xbox live private match
They give you things like cheats in Co-op Campaign.
No, when you find a death card you can use it when you start the next game if you wish.
Death cards are located at certain places of the campaign e.x. Makin atoll before first fighting check the huts for one