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Mario Kart is probably one of the biggest franchises Nintendo has. I mean Mario Kart series has only had 5 games released in its entire lifetime as a series, and it's sold close to 40 million units combined. That means on average the game sales about 8 million units haha. Its a huge franchise, and maybe the biggest one releasing next year. Well not over Brawl. Brawl has a lot more hype than MK Wii. Brawl is easily the Wii's biggest title since launch and probably throughout its entire lifetime.