From the Super Mario Wiki
The Leaf Cup is a cup that appears in the Nintendo DS game Mario Kart DS, the Wii game Mario Kart Wii, and the Nintendo 3DS game Mario Kart 7. The cup has the emblem of the Super Leaf originally from Super Mario Bros. 3 on it. In the Leaf Cup, the player competes certain race courses from previous Mario Kart games. The Leaf Cup contains tracks from the Mushroom Cup, Flower Cup, Lightning Cup (from Mario Kart: Super Circuit), Star Cup and Special Cup, and is the only retro cup to contain tracks from all four nitro cups. The Leaf Cup is slightly more difficult when compared to the Banana Cup. Just like the Star Cup, the courses tracks are usually as long as the ones in the Flower Cup and the Banana Cup. However, its difficulty is on par with the Star Cup.
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