Ugly Ducting takes place in a pipeline. During the first half, Dixie and Kiddy must swim through underwater, where they encounter some Lurchins, Kocos, and Bounty Basses. The level is a maze somewhat as there are offbeat paths leading to items such as bear coins and a Bonus Barrel. During the second half, the Kongs return on land, and they must transform into Squawks, who must continue by flying up the pipeline, where he encounters Buzzes, Krimps, and Kobbles along the way. The No Animal Sign is near the end of the level, and from there onward, the Kongs must dodge some more Buzzes until reaching the End of Level Flag.
At the beginning of the level, the heroes will have to swim through the dark pipeline, traveling up through a narrow pathway. In the next area they will enter, they will have to swim a little bit to the west and follow a trail of three bananas past a few enemies. They will end up swimming through another passageway, then entering another area. There, they will need to grab the letter K in a small alcove and head through the water, still going west. After avoiding a few Lurchins in their path, the Kongs will make their way up another opening and find a dry area out of the water. There, they will have to walk to the right to find the Star Barrel.
About halfway through the level, the heroes will have to run up the pathway and jump over a few Buzzes. After hopping over the last Buzz, the monkeys will come up to an Animal Barrel. Walking into it, the Kongs will be turned into Squawks the Parrot. Once this happens, the transformed heroes, now having flying abilities, will have to move through another opening and head west. Squawks will find many Buzzes in his path as he travels through the long pathway, though his nut-spitting abilities will be able to defeat each one easily. After finding the letter N, the bird will have to hover downwards into the next area and knock out a few Kobbles. Soon, the parrot will see a short banana trail leading upwards. He should follow it, making his way to the left to find the letter G, and then to the right to find another passageway. Going up the passageway, he will need to pass a No Animal Sign to his right and transform back into the Kongs. After that, the apes will need to run up another long path and dodge several Buzzes. Once they get over two Krimps, they will find the End of Level Flag.
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