From the Super Mario Wiki
During gameplay, the player will have to lead Miis to the bathroom. The male Miis, wearing blue clothes, will be led to the room on the left, while the female Miis, wearing pink clothes, will be led to the right bathroom. The player will use the Wii Remote to point either left or right to lead them into the right room. If they choose the wrong room, the Mii will be thrown out and the player will lose.
In WarioWare Gold, it takes place in a theater. When the movie ends, the player must tilt the system to lead the people with blue or yellow clothing to the correct bathroom. People with blue clothing must be lead to the left bathroom, while people with yellow clothing must be led to the right bathroom. The player must watch for a person stopping, as this will cause the other person behind that person to move up. If the wrong bathroom is chosen, the person will run off to the correct bathroom looking blue in the face, and the player will lose.
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