Barrel jumping
Barrel jumping is an advanced technique used with Diddy Kong. It is very similar to Lucas' zap jump except that the zap jump can be used as an extended jump but the timings are almost exact.
Controller setup
It is easiest to do with a GameCube controller or Classic Controller even though it is possible to do it with the Wii remote. To perform the technique in an easier manner, setting R or L to special is recommended but it is possible to do a barrel jump with the default commands.
How to do a barrel jump
To do a barrel jump, the player must first be knocked off the stage. Then, right as they prepare to perform the midair jump, the player executes Rocketbarrel Boost at the same time as the jump. The effect should be that instead of slightly moving downward with Rocketbarrel Boost while charging, the player glides upwards, and then performs Rocketbarrel Boost. It is extremely helpful for recovering with Diddy.