i downloaded the patches, because for some reason there were two.... anyway after the first patch which i did it before i even played the game, i noticed that the Extinction mode wasn't on the menu, then a second patch/update happened then there it was on the main menu.... but now my question comes in this after noon, my son wants to play it on his profile, but the extinction mode is not there, Why??? can anyone help me here.... thanks.
What Mem said; in order to play extinction on his profile, he has to clear the campaign mode on his profile.
Scratch that; Apparently all you need to do is go a certain distance into the main campaign.
I'm not through the whole thing yet and when I booted it up today, Extinction mode was available.
Just play through two, maybe three key areas, then come back to the main menu to see if it's unlocked.