Because they are crime fighters.
You can't. You can only be Mario unless you hack the game, which is not reccomended. If you are playing the DS remake, you can put Luigi's hat on and become Luigi.
You can’t play as luigi in Super Mario 64! Because he is not in the game
You can't.You ca only be luigi.
In the original you can play as Mario and Luigi. In New Super Mario Bros DS you can play as MArio AND LUIGI. IN NEW SUPER MARIO BROS WII ITS MARIO, LUIGI, BLUE TOAD, AND YELLOW TOAD.
There's no such thing as Luigi in Super Mario 64
once you have completed the game as Mario and beaten bowser at least twice go on the menu then press the switch that has the Mario and luigi heads on it and you will become LUIGI
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.
No, you cannot play as Luigi in Super Mario Sunshine.
You can not unlock Luigi in super Mario 64 without hacks, but he is playable in super Mario 64 DS
Luigi is in every Mario Kart game
super mario
Super Mario Bros are Mario and Luigi from the Nintendo games like Super Mario bros 1 2 3 Super Mario RPG Super Mario 64 etc Mario are Nintendos mascot and Luigi are Marios brother :)