The Gaddlight is a small flashlight that is green in color with an image of a Boo crossed out on it.
Gaddlights can be either bought or earned in boards in the game. The Gaddlight's main function is to ward off attacks from the Red Boo.
- The Gaddlight replaces the Boo Repellent from Mario Party 3.
- Even though the Gaddlight is created by E. Gadd, he doesn't appear in Mario Party 4 making his first appearance in a Mario Party game later in Mario Party 6.