The minigame takes place in a cave, containing a circle of medium-sized rocks around a slightly illuminated center, where the character hears a series of ghost-like screeches. The Boos then pop up as a circle, surrounding the player. The minigame then starts.
The player's objective is to find the leader in the Boo circle within an undefined limited amount of time. The player will have to carefully find the lead Boo by looking at the shadows, figuring out which Boo is moving first. As time passes, the group of surrounding Boos will slowly close in to capture the player. If the player picks the correct Boo, all the Boos disappear and the player wins the minigame. However, if the player guesses incorrectly, or does not choose in time, all the Boos will enclose them, making them disappear with the Boos and lose the minigame.
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