With the Wii U launch just weeks away, many people are trading-in their old Wii games to get credit for the new system. While this is a good idea for the gamer on a budget, you might want to think twice before trading the games on this list. (Donkey Kong Country Returns, Mario Kart Wii, Metroid Prime Trilogy, okami, Super Mario Galaxy, Super Mario Galaxy 2, Super Smash Bros. Brawl, The Legend of Zelda: Skyward Sword, The Legend of Zelda: Twilight Princess, Wii, Xenoblade Chronicles)
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