After unlocking the red ! boxes, go to the castle courtyard. Punch the giant boo with the cage inside of him to enter Big Boo's Haunt. Obtain the first star by defeating all the Boos to get the staircase. In the second goal, as Mario, go up the stars and into the room with the single bookshelf. Use the fire flower to float up to the room above, where you'll find a Luigi painting. Jump through the painting and defeat Big Boo to get Luigi's key.
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You can do it on the DS version. On the N64 version,the statue says"L is Real 2401". You have to run around the fountain for one minute if Luigi is an unlockable character. That's why the answer is Yes.
The developers were trying to be funny by making fun of luigi.
Only Mario but in the DS game you can play Yoshi, Mario, wario and luigi.
its in boos mansion go in the ROOM with the ? block with Mario then float up to the next room and the painting will be in there to rescue luigi
you have to get 12 stars,defeat bowser,go in the ghost world,go up to the attick and when you see a picture of luigi,defeat the king ghost and then get the key,unlock the door and then you've got luigi