Cloud City 4-13 is the thirteenth level of Cloud City. To pass this level with three stars, you should pop all pigs and score at least 81,000 points.
send Han low through the first steam, shoot the platform and laser will ricochet to the right tower. The dangling stormtroopers will twist in the steam. With a bit of luck, they will Shoot the right tower and iron string that tied with them will hurt and pop them.