When Bowser uses this move, a ball of Koopa Troopas will appear in his hand. Then, Bowser will retreat into his shell, and several Koopa Shells will appear and bounce off a random enemy, causing damage. The player must then move Bowser up and down with the , hitting the Koopa shells back and forth. The shells will get faster with each hit, and more shells will come in. This attack costs 10 SP and is unlocked after Bowser frees the Koopas in Blubble Lake.
- Mario and Luigi can talk to the Koopas before Bowser releases them. The Koopas will brag to the brothers about how Bowser is so nice to make a great appearance. They then will realize that Bowser did not free them, and will then demand that Mario and Luigi leave them alone.
- In Mario & Luigi: Paper Jam, this attack is similar to Roy bumping Wendy O. Koopa trying to attack Mario and Luigi.