Tipover, NP complete

Hi guys, im studying eletrical engineering and computer science and this semester i have a course called algorithms and data structures, the course is given in C.
But that's not what i want to talk about. This year's project is Tipover, a game whose description i wont tell but i will leave a link to anybody who's keen to try it.

You can play in this site if you want to:
http://www.puzzlebeast.com/crate/index.html

This is a NP-complete problem. I would like discuss ideas and solutions to the problem, which is quite problematic, by the way :P. Anyway, feel free to participate, any ideas are welcome.