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What happens is you complete the green castle in world8.U have this ledges after halfway point.Go through the bottom one then the middle one.To complete level, defeat the bowser & boss with a giant mussroom.After 3 things happen
1.You get a save button on the start menu. 2.You get a star next to your file 3.You get a blue toadstool house on world1 which enables you to buy wallpapers.