Bowser Jr. Breakdown

Bowser Jr. Breakdown is a boss minigame featured in Mario Party 9.

Introduction
Bowser Jr. will fly down to the stage in his Koopa Clown Car. A larger version of the car, with two clawed arms sticking out of it, will then float down, and Bowser Jr.'s car will link up with the bigger one.

Gameplay
The starting player depends on the game mode being played. If battling Bowser Jr. on the Bowser Station board, the captain takes the first turn; in other game modes, the starting player is chosen randomly. Either way, play then proceeds in a left-to-right fashion.

Players try to defeat Bowser Jr. by rolling dice numbered 1-6 to fill the gauge at the top of the screen. Each number rolled fills that many spaces on the gauge.

If a player's roll fills the gauge to a multiple of three (or to 15 or above, as the gauge stops there), the player attacks and deals that much damage to Bowser Jr. Once a player attacks, the gauge empties. If the gauge is filled to 14 - marked by the Bowser Jr. symbol - the young Koopa will roll a die numbered 1-2 and smash the player with a hammer, pounding them a number of times equal to the number rolled and causing the player to lose that many points. This does not empty the gauge, which means that a player unlucky enough to be attacked by Bowser Jr. also sets up the next player with a guaranteed 15 points.

When Bowser Jr. reaches half health, he'll add two additional Bowser Jr. spaces to the gauge. The new spaces are randomly placed, but they never cover a multiple of three or a number lower than 6. Also, if a player's roll reaches one of these spaces, Bowser Jr. will roll two dice instead of one and strike the player with two hammers for that amount of damage.

Ending
When Bowser Jr. is defeated, his clown car explodes and Bowser Jr. himself is launched into space. Several Mini Stars then appear.

Trivia

 * The players only play this boss minigame and Bowser's Block Battle on Bowser Station, instead of picking between three other boss minigames. The same thing happens on DK's Jungle Ruins.