Super Mario Bros. Deluxe (often shortened as Super Mario Bros. DX and abbreviated SMBDX) is an update of the 1985 NES title Super Mario Bros. It was released in 1999 for Game Boy Color. The game itself was left relatively unmodified from the original NES version, omitting the graphical updates of the Super Mario All-Stars version. The only differences in the "Original 1985" mode were an on-cart save feature, a world map, a fix for the "minus world" glitch, moving past the left border, and the ability to play as Luigi at any time. The cartridge also featured an unlockable re-release of the 1986 Japanese sequel, Super Mario Bros. 2, as well as add-ons such as a Challenge Mode, a Toy Box, and a Vs. Mode.