I see that the upcoming Mario game for the Wii U called Super Mario 3D World won't involve a repeat plot when Princess Peach gets kidnapped by Bowser because she's now playable alongside Mario, Luigi, and Toad since Super Mario Bros. 2. I also have to commend Nintendo for implementing the 4-player co-op mode in a 3D Mario game.
As for Donkey Kong Country Tropical Freeze, Mario Kart 8, Super Smash Bros. U and other exclusive, second-party, and third party Wii U games, I think they're going to sell well once they're released on their respective dates when they're in stores.
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