How far could the characters in Wreck-it Ralph travel from Game Central Station?

In the movie Wreck-it Ralph, characters can move from game-to-game using the (dodgy) power-board known as 'Game Central Station':

Are we to believe that every game in the arcade is plugged in to this one power board? (eye-twitch)

Or can the game characters travel further up the power lines than Game Central? Visit other games plugged into other wall outlets etc. Could they theoretically access the main power grid and travel to other arcades?

Is the answer "A Wizard did it", or did I just give away the main story arc of Wreck-it-Ralph 2?

Answer

This was directly addressed by the film's lead actor, John C. Reilly (who portrays the titular Ralph). In short, the possibility of traveling beyond Litwak's Arcade was already under consideration even as the first film was being marketed.

Movieline: So here's the big question: If there are, say, hundreds or thousands of similar arcades out in world beyond the confines of Litwak’s Family Fun Center, does that mean there are potentially many more Ralphs out there? And are they all going through the same existential journey at the same time, in their respective arcades?

JCR: Duplicate Ralphs?!

Movieline: Multiple souls, maybe? What’s going on here?

JCR: Wow. I never even thought about that. That’s surprising, after three days of a press junket, to think about that for the first time. I don’t know! Are they all experiencing the same thing at the same time, or is it a Matrix-like situation? This is the next creative leap. The next leap of imagination that people can make after they see the movie. The first one is like, what is it like to be inside a video game, to be a video game character – that could be a sequel, or something. And could you go into the surge protector and into the electricity network… That could be the next destination.

_{^{John C. Reilly Ponders The Existential Questions Of 'Wreck-It Ralph'}}

And in Ralph Breaks the Internet the characters do indeed travel to the Internet via a modem.

On a side note, we learn that Sugar Rush is a vanishingly rare 'import' game and that other Wreck-It Ralph machines are almost all broken/obsolete so the odds of coming across a second actual Ralph or Vanellope in the Internet are very low indeed.