Rocketbarrel Boost (mislabeled "Rocketbarrel Blast" in Brawl's manual) is Diddy Kong's Up Special Move in Super Smash Bros. Brawl. It is his basic "recovery" move. By holding Up+B, Diddy will charge the rocketbarrels, and when fully charged, it goes a long distance, and it can be angled left or right as well. The distance depends on how long it was charged.
This move has a unique property to physically react when it goes into a wall (unlike most other attacks in Brawl that simply resume the animation). If Diddy collides with a wall or another character hits him, his flight will take an abrupt stop, his pack exploding and the tow rocketbarrels flying off randomly. He will receive a small amount of damage when he collides into a wall.
"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."
- Donkey Kong 64 (1999)
- Donkey Kong: Barrel Blast (2007)