Quzzle

I saw this article on slashdot about a brain teaser game, and it got me thinking. I wanted to see if I could solve it. So I whipped up a little flash applet (since I can do that now). I still haven't been able to solve it… let me know if you can. The point is to get the big 2×2 square from the top left corner to the bottom right corner. UPDATE: I solved it!