The Barrel Cannon glitch is an exploit of the freeze glitch that can be used to get a large number of combos. It can be done by Ice Climbers on any stage with a flat surface. The user must have a Barrel Cannon and any two opponents.
How to perform
First, do the Freeze glitch on any opponent. When the opponent is frozen, grab a Barrel Cannon and throw the Barrel Cannon at the opponent. The opponent should be stuck in it if performed correctly. Then, perform the freeze glitch on the second opponent. Once the second opponent is frozen, throw him/her at the barrel cannon. The frozen opponent should be stuck in the barrel cannon and rack up a decent amount of damage.