Well, you could ssh tunnel. However you'd need an intermediary, or an alternate way you could use like a socks or something like that, cuz you won't be able to make the connection yourself. Like say you connect your dorm pc to the one at home, that kind of deal. Create the ssh connection, then have that one connect to here. It'll be encrypted. So they could see a large amount of data going through, but won't be able to tell what it is.
This however can get you in alot of shit, in various ways. For the socks way, the owner of whatever server you use is going to be getting additional costs in bandwidth, this will probably not please them, so your chances of finding an open one for gaming are fucking sliiiiimmmm. For the ssh tunneling, IT departments tend to frown on that, even if they are willing to unblock them, because you were a dick and didnt just ask. I would suggest however calling from a public campus phone and not giving a name if possible when you're asking though. Just in case you decide to go the sneaky route later on. But its a bit late for that. Really I'd just say I play a game with friends of mine back home, and it's blocked here, and I would like to be able to play it. Simple as that, though I'd add in the friends back home part even if it weren't true. A little se never hurt anyone..much.