Mama (Luigi), with the ability to jump higher and lightly hover at the top of her jumps, Mama was a good choice for areas with long gaps. Luigi took her stead, and in later games he kept his special jumps.

since the original Japanese Super Mario Bros. sequel, Super Mario Bros.: The Lost Levels, was deemed too difficult for overseas players.

Additionally, the albino Mouser boss, perceived as too difficult for American gamers

which Nintendo of Japan feared was too advanced for European and American gamers.