on the wii: keep battling goons, when scarecrow turns on the hallucination gas, he will appear to grow giant. grapple up to the left and pull the lever. the gas will turn off. hit scarecrow until he turns the gas back on. (note: whenever he turns the gas on, you can go over it to reach him, but you can't hurt him.) the goons will attack, break them and then grapple up to the right. pull the lever and the gas turns off. punch scarecrow to make him shrink, and then the final blow will end the level.
on the ds: you see him disappear, watch out, the spiky statues know where you are! tip: stay in one place until they get ready for the strike. run and they will get stuck in the ground. hit them until they stop turning green when you punch them. then repeat the process. after two rounds of this, scarecrow will appear on the chandelier, which will turn from black to golden, and that means the statues and the chandelier will try to attack you. repeat the process of hitting the statues, but also, when the chandelier comes down to bite, punch it when it stops. after it is all done, scarecrow will appear on the stairs, tired from his work. but not tired enough to not hit you! hit him until all his hearts are gone, then the level will end.