Bowser's Big Blast

Bowser's Big Blast is a Battle minigame in Mario Party 2 (where it is stylized as BOWSER's Big Blast) and a Free-for-All minigame in Mario Party: The Top 100 and Mario Party Superstars.

Introduction
A Bowser bomb is screwed into place by a mechanical arm, and the camera zooms out. The four characters enter the room it is in and get in line (with the exception of the first player up to press a plunger) while the plungers appear. The minigame then begins.

Gameplay
This is a luck-based minigame. The players take turns pressing down the switches connected to a massive Bowser bomb. After a player presses a switch, the game decides whether they are safe or not. If steam comes out of the bomb's "nostrils," then the player is safe and moves to the end of the line. However, if the wrong switch is pressed, then the bomb's eyes will count down from three, eliminating the player when it explodes. The process repeats until there is only one player left, and that player is declared the winner. There are five switches in different colors: red, pink, yellow, green, and white. Each time a player is eliminated, the number of switches will decrease by one until there are only three left. If everyone presses down a switch that does not set off the bomb, then a new set of switches will appear.

In Mario Party: The Top 100, the explosion of the bomb is more detailed. The characters also breathe a sigh of relief if the bomb does not explode or take cover if it does.

In Mario Party Superstars, along with the animations added in The Top 100's variant being present here as well, the characters now hold their breath after they choose a switch. Also, if they choose a wrong switch, the bomb emits electricity and turns bright white when it explodes and also takes a slightly longer time to explode compared to the original. The player who sets off the bomb will also panic before it explodes. On some copies of this game, black squares are visible in the background and if someone chooses a wrong switch, the bomb fades to white when it hits zero before exploding.

Mario Party 2

 * – Move
 * – Press plunger

Mario Party: The Top 100

 * Move
 * Hit switch

Mario Party Superstars

 * (Left and Right) – Select Switch
 * – Hit Switch

Mario Party 2

 * Game Rules – "Take turns pressing the plungers. If Bowser blows up on you, you're out. Last one standing wins!"
 * Advice – "Just because a plunger detonated Bowser once, doesn't mean it will again... Or does it? Give it a try!"

Mario Party: The Top 100

 * Description – "Guess which switch won't detonate the bomb! The last one standing wins!"
 * On-screen – "Hit a switch that won't explode!"

Mario Party Superstars

 * "Take turns pressing the switches. If Bowser blows up on you, you're out."

Trivia

 * The giant Bowser head was later also used in Mario Party 5 in the Panic Pinball and Head Waiter minigames and Mario Party 6 in the Seer Terror minigame.