Boo Radar

The Boo Radar is a feature on the Game Boy Horror. During the event's of Luigi's Mansion,after Luigi let all of the boo's in the mansion to roam free,E. Gadd showed him the Boo Radar. If the light is blue,there was no boo's in the room. If it was yellow,there was a boo in the room (or just something round,like a ball or a bomb). If the light was red,a boo or something round was right in front of Luigi, and he would use his Poltergust 3000 to suck it up.