The Mega Man World series, known as Rockman World (ロックマンワールド Rokkuman Wārudo) in Japan, is a series of side games in the classic Mega Man series released on the Nintendo Game Boy. While not officially referred to as World games in the English release of the games, instead being numbered with Roman numerals rather than regular numbers to separate them from their NES counterparts (though some NES games had Roman numerals in their title screens), unused graphics in the game's files suggest the English release was planned to use the subtitle. All of these titles are currently available for download on the Nintendo 3DS eShop, though the eShop will close in March 2023.