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 * In the final level of World 9 in Super Mario Bros.: The Lost Levels, a group of tile blocks (pictured) can be found spelling out "アリガトウ！" (Arigato!, meaning "Thank You" in Japanese).
 * According to an interview given in Family Computer Magazine, Shigeru Miyamoto added World 9 in Super Mario Bros.: The Lost Levels due to the interest in the Minus World-esque "World-9" levels in the Japanese version of the original Super Mario Bros.
 * In Donkey Kong Country Returns and its Nintendo 3DS remake, Mr. Game & Watch makes a cameo appearance in the background of the level Foggy Fumes.
 * In Paper Mario: The Thousand-Year Door, Gloomtail's room is similar to the spike room in Hooktail's Castle; if the player uses Bobbery at the right end at the wall, a room will open and an Ultra Shroom and a Jammin' Jelly can be collected.