But according to Valve's Doug Lombardi, the Bellevue, Washington-based studio may move further away from its typical territory than you might imagine.

"There's a lot of people at Valve who are parents and would love to make a game for kids," said Lombardi to CVG. "We all play the Wii a lot and we think that the proper way for Valve to approach the Wii would be to make something cool designed specifically for it.

"I mean, I'm not making any announcements, but there's a lot of desire internally to do something for kids, do something on the Wii."

And as long as we're talking extreme divergence, why not a Valve MMO, headed up by company co-founder Gabe Newell?

"Gabe is a huge fan of MMORPGs and he's always wanted to make one, but that's a big risk to venture out on," continued Lombardi.

"I think at some point you'll see us move a little further out of our comfort zone than Portal was, but it's not going to be this year or next."