Yoo Who Cannon is a Bros. Attack used by Luigi in Mario & Luigi: Brothership. Read on to learn how to use Yoo Who Cannon and how to unlock it!

How to Use Yoo Who Cannon

Remember Which Barrel the Clones Went Into

Keep track of which barrels the Mario and Luigi clones each went into. To launch them, press A for Mario and B for Luigi. Each correct guess grants an additional shot.

Focus on remembering the position of either Mario or Luigi, then use process of elimination to figure out the other.

After successfully launching all clones, press X to fire them together as a giant ball, dealing tons of damage to all enemies!

Yoo Who Cannon Basic Info

Bros. Attack Overview
Yoo Who Cannon
BP Cost	12
Target	All Enemies
Description	Remember who got in which barrel. If it's Mario, press A, if Luigi B. Finally, press X to launch.

How to Unlock Yoo Who Cannon

Unlocked During Your Journey to Wayaway Island

Yoo Who Cannon, along with Clockout Blow, is unlocked at the start of Ampberry Device main quest, where you'll embark on a journey to Wayaway Island.

Yoo Who Cannon Challenges

Complete the Yoo Who Cannon Expert Challenge

No.	Challenge	Guide	Rewards
10	Yoo Who Cannon Expert	Get 30 EXCELLENTs with the Yoo Who Cannon Bros. Attack.	・Speed Bean x3 ・Defense Bean x3

How to Unlock and Complete Every Challenge

Mario and Luigi: Brothership Related Guides

List of All Bros. Attacks

Mario's Bros. Attacks

Red Shell

Hatch Me if You Can

Bomb Derby

Clockout Blow

Conductor Connector

Luigi's Bros. Attacks

Green Shell

Zapperator

Jump Helmet

Yoo Who Cannon

Max-Mix Vortex