Single game tickets go on sale Saturday morning, 9/27 at 9am, at the above number. From experience, I'd suggest calling well before 9. If you can get standing room tickets scattered, take 'em and stand together anywhere. No one has kicked us out of our squares yet, and I've gone five seasons in a row.
Another strategy that's worked for us, if you have the time on your hands, is to get to the ticket office at Mariucci about 4pm on Friday, gameday. There are usually a handful of unused tickets that come back from the Gopher family and friends section, but you have to wait in line a good hour, at least. We sat next to the Guyers during the Friday game last season.