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 * Morton Koopa Jr. (pictured) is the only Koopaling to be portrayed by both female and male voice actors.
 * Donkey Kong Country Returns is Retro Studios's first game that is not of the Metroid Prime series.
 * Hotel Mario is the first Mario game to have extensive voice acting and full dialogue.
 * As of Mario Kart Tour, Wario Stadium is the only track from Mario Kart 64 that has not yet returned as a retro course in a later installment.