Taking place in the game's final factory level, the heroes encounter a hazard seen in other factory levels. They find several Bazukas in the level, along with many barrels. Bazukas appear all over this level, and they can be a major hazard if the Kongs aren't careful. These foes, however, can also be a help on the monkeys' quest, as their barrel-blasting cannons can shoot out barrels, which can be used to cross wide abysses. Moving platforms and tightropes also appear often in this level to help the monkeys cross tubs of hot lava. Barrel Boulevard features many other enemies next to Bazukas, including Bristles, Sneeks, Krumples, Re-Koils, Karbines, Buzzes, Knockas, Klasps, and Kobbles.
From the start of the level, the Kongs must walk down the factory's path to find a barrel. It blasts them to a lower area, where they meet a Bazuka. They need to jump over the foe and grab the letter K in an alcove. Farther on, they find some more Bazukas to avoid, along with some Krumples. Soon, the apes need to drop down to a platform and ride down on an elevator, while watching out for a lone Karbine, to reach a lower area. There, they meet another Bazuka and the letter O. The group have to continue through the level from there and travel west, defeating some more enemies. After dropping into a couple of small pits, the Kongs find another Bazuka to dodge. Passing this foe, they need to fall through another pit and hit the Star Barrel around some platforms jutting out of the walls.
Halfway through the level, the heroes ride down an elevator to grab onto a rope. They have to climb across this long rope while dodging a Klasp to reach solid ground again. There, they need to defeat a few Bristles and hop down some more ledges, finding other enemies to beat. Soon, they have to jump platform to platform and dodge a Karbine to reach a lower area of the level. After hitting into the letter N, they grab onto another tightrope. Climbing across this will lead the heroes into more enemies. They must avoid each of the Buzzes and Karbines to end up in a small space with a Knocka. After this, they need to fall into a small gap and head under some Buzzes to find a barrel. It blasts them to the letter G and then to the next floor of the level. From there, they have to travel west again and defeat a few more enemies to find another barrel. It can blast the heroes into another chain of barrels to get to an even lower part of the stage. At this point, Kiddy Kong and Dixie Kong need to ride down an elevator to find a rope. They have to climb along the rope and let go of it at a dead end to find a Bear Coin. Back on the ground, they need to head west and drop down into a pit. There, the Kongs have to walk a little farther to find the ending flagpole. Once they touch it, they end the level.
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