Video walkthroughs can be found here: http://www.angrybirdsnest.com/category/bad-piggies/

Pictures of carts for each world (except El Porkado): http://www.badpiggieshelp.com/ground-hog-day/ http://www.badpiggieshelp.com/rise-and-swine/ http://www.badpiggieshelp.com/when-pigs-fly/ http://www.badpiggieshelp.com/flight-in-the-night/ http://www.badpiggieshelp.com/tusk-till-dawn/ http://www.badpiggieshelp.com/road-hogs/ http://www.badpiggieshelp.com/sandbox/

Best of luck!