On the first and second levels on transformers as an autobot, each level has a housing estate. go up to a house. any house.then smash it up. (don't worry abot the x's, they don't do anything excert bring in tanks, and that's if you get 5 in a row loads.) after you have done that, walk a while away and - the house has been fixed! then go close again, and it's destroyed!