I just received the ticket for east lower north family area for Thursday's match against Basel.  The question is if I go there alone, will I be admitted in? I just bought the individual adult ticket by mistake for this area and I have received my ticket... Does anyone have relevant experience?

I'm sure it'll be fine mate, otherwise they wouldnt sell a single ticket.

Plenty of people do this and then if questioned say their kid or younger brother etc has already gone in. I doubt you'll be questioned though, the queues are big to get through the turnstiles so they wont slow them down. 

Edited May 1, 201311 yr by Alex

As covered by Alex in first sentence ;)