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Go to the entrance of the castle where the light is shining down and look up. You will be teleported to an area high above the clouds. There you will find the switch that turns all "!" blocks solid. Then go to Big Boos Haunt and go to the library. There you will find a "!" block. Make sure you are playing as Mario. Grab the Power Flower and inflate into a balloon. Float up to the secret balcony and go through the door. There you will find a picture of Luigi. Jump into it and beat King Boo to unlock Luigi.

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15y ago

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