Today, Push-Cars open a brand new special level. The password is "angie". So far, one of the most challenging levels. Took us a while before we were able to solve it.
Only if you really can't seem to figure it out, here's the screen shot of the PushCars special level 1 Angie hint. Enjoy!
Here's the YouTube video link, if you want to watch how it's done - http://www.youtube.com/watch?v=bPfNDWJ5KqU