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The blunderbuss is Kaptain K. Rool's weapon he carries with him during the events of Donkey Kong Country 2: Diddy's Kong Quest and Donkey Kong Land 2. It is able to fire Kannonballs, spiked Kannonballs, barrels, and status-afflicting mists, which either freeze, slow, or disorient its targets. Ammunition can be fired at different heights and as various shots - straight, bouncy, and swirly. The blunderbuss may be used as a vacuum to pull in targets, whereupon the user can strike them with the butt of the gun. Additionally, it can also be used as a means of movement, thrusting the user forward at high speeds by aiming it in the opposite direction and using the jet propulsion with the barrel acting as the exhaust. However, if anything is jammed inside the barrel of the gun, the blunderbuss will misfire and explode in the holder's face.
Kaptain K. Rool uses the blunderbuss during the first duel with Diddy Kong and Dixie Kong inside his airship. He is shown battering Donkey Kong with the butt of the gun and shooting Kannonballs at him while he is tied up. He then attempts to stop the Kongs from rescuing DK by firing more projectiles at them, but his weapon gets jammed with Kannonballs over the course of the battle. K. Rool is defeated, but takes his blunderbuss with him, as he falls down Crocodile Isle and lands in his swamp.
He uses it one last time in an attempt to end the Kongs for good in Krocodile Kore. But once again, after a Kannonball jams his gun, it misfires and sends Kaptain K. Rool into the core of Crocodile Isle, consequently sinking his entire island into the ocean. The blunderbuss is last seen with K. Rool as he sails away on a raft in the ending scene.
The blunderbuss appears in Super Smash Bros. Ultimate, where it serves as King K. Rool's standard special move. When taking out the blunderbuss, King K. Rool dons his pirate hat, referencing his "Kaptain K. Rool" alter-ego. King K. Rool fires a Kannonball out of the blunderbuss, dealing damage to enemies in its path. The blunderbuss can also suck in opponents or its own Kannonballs (if reflected back at King K. Rool, or if they hit the opponent), and spit out its Kannonballs and other projectiles for extra damage, or spit opponents out for minimal damage; spat-out opponents also inflict collision damage if they come into contact with another opponent. He can also slip through platforms while using it.
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