Mario Tennis Open (マリオテニスオープン Mārio Tenisu Ōpun) is a sports game developed and published by Nintendo for the Nintendo 3DS handheld game console. It is the sixth installment in the Mario Tennis series and the first to be released for the 3DS. The game features a variety of play modes, including singles, doubles, and tournament play. In addition, players can also take part in a variety of mini-games, such as Ring Shot and Galaxy Rally. The game also features online play, allowing players to compete against each other over the internet. Mario Tennis Open features a variety of characters from the Mario series, including Mario, Luigi, Peach, Daisy, Wario, Waluigi, Bowser, and Donkey Kong. The game also features a variety of courts, including grass, clay, and hard courts. Players can also customize their characters with a variety of clothing and equipment. Mario Tennis Open is a great game for fans of the Mario series, as well as tennis fans of all ages.