There is actually a way to score that much, but it would probably takes quite a bit of time to do it. I would not say it does not involve cheating, but the score would be taken up to take amount normally by the program.
There is no way to actually prove anything, here. Although, it does appear that the image on photobucket was doctored. That is, at the vertical where the triangle was stopped, there sems to be missing walls (one above and one below, exactly at the same point). With that, and how far the image was inside the wall, as well as the fact that the first 5 digits in the score are all 8's, and also how long it would take to accrue a score so high so soon after the scenario was published, all lead me into the believe that things are not all what they appear to be, in this case.
2012/9/9
Private Messaging
2012/9/7
Game of Life (Conway's)
2012/9/6
Reflex tunnel
2012/9/5
Reflex tunnel
2012/9/5
Reflex tunnel
2012/9/5
Reflex tunnel
2012/9/5
Reflex tunnel
2012/9/5
Reflex tunnel
2012/9/5
Reflex tunnel