Luigi is Mario's younger, taller, and thinner twin brother. Luigi has helped and fought alongside his brother in many occasions. Throughout his life, he has lived in Mario's shadow, both developing and cowardly and heroic tendencies. Super Mario Bros. marks his first appearance in the Mario Series and his debut in general. Origonally a palette swap of Mario, Luigi was created to facilitate a second player option. Since the two player mode was dropped from most main Super Mario games beginning with Super Mario Land, Luigi has gained his own identidy and personality.