Cloud City 4-28 is the twenty-eighth level of Cloud City. To pass this level with three stars, you should pop all pigs and score at least 82,000 points.
Send Obi-Wan through the small chains holding the compressor above the level. Direct The Force down-and-right, approximately towards the farthest pig. The compressor should clear the entire right side of the level. Use Luke to finish the remaining pigs.