Gold Mouse

Gold Mice are "scaredy-mouse-like" animal ghosts found in Luigi's Mansion. They only pop out once Luigi examines a slice of cheese with his Game Boy Horror, then the Gold Mouse will run around and around the room before they scurry through the wall. Random Gold Mice, which are less likely to appear, appear in five predetermined rooms or hallways 20%-25% of the time Luigi steps forward into the room or hallway, for a total of ten mice altogether in the mansion. If Luigi manages to defeat a Gold Mouse by sucking them up before they escape, a large amount of money, larger than the amount of money the Speedy Spirits give, will spray from the blowhole of the Poltergust device, which will include valuable treasure like Gems. These Gold Mice do include a Silver Diamond during the PAL version in the Hidden Mansion mode. Note that, unlike the Speedy Spirits, if Luigi does not succeed when he spots the Gold Mouse, he can exit and enter the room again and target the slice of cheese to summon it again.

Locations
This is a "Gold Mouse List" of where all ten of the Gold Mice can be found in the game, with rooms and their money and coins.

Within cheese pieces
For information to inspect for these colorful Mice, is needed for the green-capped plumber to scan a slice/piece of cheese (which is "not visible" for the player on the normal camera zoom of the gameplay) with the Game Boy Horror.

Random Mice
Five of these Mice, although, are found in rooms (or hallways) without any cheese. When the player steps into some specific rooms, there is a 20%-25% chance of a Gold Mouse to pop out. The player must react quickly to catch them.

Trivia

 * Just like the Speedy Spirit, if one defeats a Gold Mouse with an element, it does not expel money.
 * The Tea Room is the only room which contains two Gold Mice: one found by checking a piece of cheese, and another found randomly.
 * Whereas all Speedy Spirits give Luigi 20 Coins, all Gold Mice give him 30 Coins.
 * The sealed room mouse can be the most tedious as Luigi will have to return to the roof to reenter the room if it doesn't spawn.