Flashlight

Flashlight is an item Luigi uses in Luigi's Mansion. When Luigi first enters the mansion, he is only armed with the flashlight. When Luigi progresses in the game, however, he can use it to stun ghosts. All he has to do is hold down the B button and let it go to release a flash of light.

The Flashlight, under stylus control, is also used to stun Boos in the Super Mario 64 DS minigame Hide and Boo Seek, which New Super Mario Bros. also includes.

The Flashlight is an inventory item in the book Flown the Koopa. If they have it, Mario and Luigi use it to explore the basement of Magikoopa's fortress, but the batteries die, leaving them vulnerable to a pack of Mega Moles.