I've tried the area in the Star Woods at the bottom right-of-center part of the overworld where there's a bridge with all those tentacles, but that only gives me four seconds of continuous rolling for the Dizzy trophy. Where is a good location to perform this trophy? Thanks, all! Found it and got it! It's in Fluffy Fields just to the top right of where you strike the pillars in ascending order. You roll along the top of the screen horizontally across.