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 2nd 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.
You got that dude?
Cool.
this answer is really simple all you have to do is win alot of times and it will do the rest for you. your welcome
in the middle of peaches castle unlock the room and go upstares and master the game with the clocks. i think
the three keys unlock mario,luigi and wario
Get 30(31stars after beating second Bowser)then go to the top room and powerflowers are there(works on Luigi)then go in the mirror(in mirror room)then go into the Wario Picture.
You cannot unlock 8 bit Luigi in Super Smash Bros. Brawl. You can unlock Luigi though.
You can not unlock Luigi in super Mario 64 without hacks, but he is playable in super Mario 64 DS
Super Luigi Galaxy isn't a real game but in both Super Mario Galaxy and Super Mario Galaxy 2 you can unlock Luigi and play him.
you can unlock luigi detective.
Luigi is not in the game, he already joined the game 2017
play as luigi 3 times.
It is impossible
You will "find" him after chapter 6.