yes
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No you can't play multiplayer offline only single player. But you can play it online with other online players.
Up to 4 players can play simultaneously in call of duty black ops multiplayer.
Yes. If you use the same system, that is
for online you need to add a guest, to do this you press Y or triangle
Enter no password, and the options will appear of 'play offline' or 'try again'. Select play offline.