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Go to the Snow Level room (forgot the name), the room that has Tiny-Huge-Island, with all the mirrors that you jump into the wall for the level. Go as Luigi, get the flower that will make you go invisible, go through the mirror and jump into the painting with Wario on it.
Also, go through the door as well, secret star.
You've much yet to learn... Mario Strikers: 133245 496130 Brawl: 524118 745554 Kart Wii: 322267 469437