Mario and Luigi (マリオ＆ルイージRPG Mario ando Ruīji Aru Pī Jī, lit. Mario & Luigi RPG), is a series within the Mario series. It contains role-playing games that star Mario and Luigi going on various adventures. The initial installment of the series, Mario & Luigi: Superstar Saga, was released for the Game Boy Advance, the following two were released on the Nintendo DS, and the latest were released on the Nintendo 3DS. The Mario & Luigi series is one of the two main RPG series in the Mario series after Super Mario RPG: Legend of the Seven Stars with the other being the Paper Mario series. Compared to other RPGs, the tone of the Mario & Luigi games is generally more whimsical and lighthearted, with various in-game jokes and comical references to the heritage of the Mario franchise.
For all of the Mario & Luigi games, the player uses // to control Mario while they use// to control Luigi. As for Mario & Luigi: Partners in Time, the player also uses the button to control Baby Mario and uses the button to control Baby Luigi. These two buttons are also used to control Bowser's attacks in Mario & Luigi: Bowser's Inside Story, and Paper Mario's in Mario & Luigi: Paper Jam.