From the Super Mario Wiki
In this minigame, the player points the Wii Remote at the screen and then moves the cursor to aim. In order to shoot, the player has to press the or button. The object of the game is to blast the Boos before they get to the player to score points. If the player blasts a lot of Boos in a row without missing, then they score more points. Sometimes a Boo will fly across the screen, holding Toad. If the Boo is shot, Toad is saved and the player will be rewarded an item, but if the player shoots Toad, they are docked points. If a Boo gets too close, it will attack, costing the player a life. If the player loses all his or her lives, the game is over. Ten rounds are required to complete this minigame.
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