Killer Jr. Ball

Killer Jr. Ball is the name of the Special Ball that Bowser Jr. uses in Mario Superstar Baseball. While pitching, Junior is able to throw a Bullet Bill at the batter. The Bullet Bill moves slowly towards the player, flips around, and then flies past the batter at high speed.

If Bowser Jr. is batting, he is able to turn the ball into a Bullet Bill once contact is made. If caught, the Bullet Bill pushes the catcher far back. The only difference between Jr.'s Killer Ball and Bowser's Killer Ball, is that the Killer Jr. Ball wears a bandanna, just like Bowser Jr. himself.

Challenge mode exclusively, the player must obtain the Jr. Mask Power-Up in Challenge Mode of Mario Superstar Baseball before being able to use this move.