Once you get enough shine coins, go through the second special door. The four special doors are to the right of the level creation portraits. You have to go through a secret passage to get in. The secret passage is located to the northeast of the level creation room. When you go through the door, you immediately come out as Luigi. Obviously, he mugged Mario and switched places with him before anyone could notice. :)
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enter the 32 Star-Coin door to toggle between Mario and luigi
Easy. If you unlocked the Volcano tile set, Lava should be in there.
You need 32 star coins(not sine spirits!) and got to level design room go all the way to right and open the 2nd door and say hello to Luigi.
There's no such thing as shine sprite groups in Super Mario 63.
run under him when he jumps, then dive (down arrow) for his tail. then press right and left repeatedly. There is a Super Mario 63.