I only have vague memories of this show but am for some reason determined to find it.
From what I can remember it was about a group of friends getting sucked into a game console/TV and going on adventures in another dimension that seemed to be very rocky.
I'm sure I remember a giant robot/mech at one point. It was most likely aired on Cartoon Network/Boomerang/Nickelodeon but I can't be sure.
It may have only been a miniseries or even just a single animated film. It could even be just a single episode from a series.
I've check a bunch of lists on Wikipedia and can't seem to find it.
If it helps, I'm from the UK, so it could have been a show only available here.