Supper Mario Broth on Twitter: "During the minigame "Hole Hogs" in Mario Party 9, green hills can be seen in a corner (top left). Zooming out (top right), we can see that
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World 9-7 - New Super Mario Wii Wiki Guide - IGN
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World 9-2 (New Super Mario Bros. Wii) - Super Mario Wiki, the Mario encyclopedia