While this form of "Super Mario Bros. 2" was released in Japan, it was thought to be too hard for the American public at the time. In 1988, as a result, an alternative release was developed to be good enough as "Super Mario Bros. 2" for western players (and in the future released in Japan as "Super Mario USA"). This would play a key part in forming the current look of Luigi. The game was a conversion of "", with the art changed to be characters and places from the "Mario" series. In this release, the character of "Mama", who could jump the highest, was good enough for the model for Luigi. This caused his taller, thinner look, combined with his Mario-design outfit and green color. There were appearances of Luigi being taller than Mario before - for example, in the 1988 Famicom Disk System game "" and before that, in a very limited 1986 anime "" (though in the anime he had a yellow shirt and blue overalls). Licensed art for "Super Mario Bros. 3" and "Super Mario World "presents Luigi with this new look. Nintendo of Japan would not change his art differences to his look within the game until the 1992 game "Super Mario Kart". The appearance of Luigi from the "Yume Kōjō: Doki Doki Panic" version of "Super Mario Bros. 2" has been used ever since, even for games made again in which he was a palette swap to start with.