Cloud City 4-33 is the thirty-third level of Cloud City. To pass this level with three stars, you should pop all pigs and score at least 97,000 points.
Send Lando through the highest chain on the left side of the level, then blast low into the base of the rightmost structure. The key here is to aim for the footing of the right structure and not for the pigs. The falling compressor should clear everything else for you. However, red laser blast is weak to the right structure and the compressor can be redirect and leave some pigs in the level. Using two or more birds is impossible to get three stars.