Kleever is a large, floating sword that appears in Donkey Kong Country 2.
Donkey Kong Country 2: Diddy's Kong Quest
When Diddy and Dixie engage battle in Donkey Kong Country 2: Diddy's Kong Quest, the battle starts with Kleever rising from the lava and throwing three fireballs. A kannonball will appear after doing so. The Kongs must throw it directly at Kleever to hurt it. Afterwards, it will appear to be shaking in anger and pain, as it flashes red. Several hooks will then appear above the lava. Jumping onto each of these hooks to get to the other side will reveal a ready cannonball to use. The Kongs must rinse and repeat until he appears to sink in the lava slowly, as if defeated.
However, this is merely to let a player's guard down, as he will rise completely out of the lava, angry and ready to finish the fight. It will approach the Kongs and try to stab them. Dodging this attack (or sacrificing a Kong) will make the hooks appear once more, only spreading up to the top of the screen. The Kongs need to use these to get to the other side and grab the cannonball, and rinse and repeat to defeat him.
In the Game Boy Advance remake of the game, the boss Kerozene also uses two smaller Kleevers to attack the Kongs twice. They only slice up and down while aiming at the monkeys. They, unlike Kleever, can be defeated in one hit by a kannonball.
Donkey Kong Land 2
Kleever is fought differently in Donkey Kong Land 2, and is instead fought at Krem Cauldron. He will shoot fireballs, but one will end up being a barrel, and when jumped on it will make a Kannonball. After hitting it with the kannonball, the Kongs must cross the lava gap on Krocheads, and do the same. Then, Kleever will stab at the Kongs. It must be jumped over. While Kleever's still airborne after the thrust, the Kongs must put a kannonball into the nearby cannon to damage it. The Kongs must do so again on the other side to defeat it.