How do you get luigis masion in brawl?

To unlock Luigi you must complete the first stage of adventure mode with a time of xx:x2:xx, then complete the remainder of adventure mode. You will fight Luigi at the end of the adventure mode. Defeat Luigi and he will become a playable character.

You can also unlock Luigi by playing 800 versus mode battles. The winner of the 800th game will be challenged by Luigi. Defeat Luigi and he will become a playbale character.