Diddy Kong activates a Rocketbarrel Pack and starts charging it, slowing his fall. When the special attack button is released, he propels himself in the chosen direction.
The distance the Rocketbarrel Boost will cover depends on how much the attack is charged. During the charging period, the angle that Diddy travels can be altered by tilting the Control Stick left or right; charging the move longer allows a more significant angle shift.
Touching an opponent while ascending will cause minor damage. The initial burst when used in the air may serve as a meteor smash, spiking the foe while Diddy recovers to safe ground. If Diddy is attacked while using the move, the barrels will fly off and become randomly-moving, unblockable but reflectable projectiles, exploding on contact with the stage. If Diddy hits a ceiling while using the move, he takes about 5% damage.
In Super Smash Bros. 4, the move can be used to travel at more horizontal trajectories, improving the move's uses for recovery.
If Diddy Kong uses Rocketbarrel Boost while swimming, Diddy will sink down a bit and then float back up. Before he floats back up a small splash animation will be seen at the top of the water.
Barrel jumping is an advanced technique in Brawl and SSB4. It is very similar to Lucas's zap jump except that the zap jump can be used as an extended jump but the timings are almost exact. The player must first be knocked off the stage. Then, the player executes Rocketbarrel Boost at the same time as a midair jump. Instead of slightly moving downward with Rocketbarrel Boost while charging, the player glides upwards, and then performs Rocketbarrel Boost. This can aid Diddy Kong's recovery tremendously.
Special Move customization was added in Super Smash Bros. 4. These are the variations:
The Rocketbarrel Pack trophy is unlocked by clearing Level 4 of Target Smash.
An item that looks like regular barrels but becomes a rocket-powered jet pack when Diddy Kong straps them on his back. It's a convenient gadget to have when adventuring, but for whatever reason, Diddy also uses it when playing tennis and basketball. The moves he can pull off with the rocketbarrel pack are so cool that they're almost not fair. Almost.
Rocketbarrel Boost is one of Diddy Kong's moves from Donkey Kong 64, which he can purchase from Cranky's Lab from the second level (Angry Aztec) onwards. Diddy Kong uses it to fly in the air for a short time and can also use it with his Peanut Popguns to shoot at foes in the air. The move also appears in Donkey Kong Country Returns, where it allows Diddy (and Donkey Kong, if the two are paired up) to temporarily hover. The Barrel Jet itself has a different appearance in Donkey Kong Country Returns and the subsequent Donkey Kong Country: Tropical Freeze: a tan cloth backpack containing a single rocket-shaped barrel on a metal arm. Despite this redesign, SSB4 retains the move's appearance from Donkey Kong 64.
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