From the Super Mario Wiki
When the fight begins, Kleaver will start launching fireballs at the Kongs. However, every third time, he will throw a barrel instead. Jumping on it will reveal a Kannonball, which can be used to attack Kleaver. Hitting Kleaver will cause him to start chasing the Kongs. They must jump across several Krockheads and get to the other side of the lava pit, where Kleaver will resume throwing fireballs. After the second hit, the Kongs must cross the lava pit again. At this point, Kleaver changes tactics. Instead of throwing fireballs, he will try to stab the Kongs. A Kannon will appear; the Kongs can use it to launch another Kannonball at Kleaver. After that, the process repeats, and one more hit will take down Kleaver. The Kongs are rewarded with a Banana Bunch Coin for defeating him.
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