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Nintendo has revealed an image of the prototype Wii U GamePad, involving two Wiimotes and some double-sided tape.

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Wii / Wii U Pro Controller - Nintendo Wii - Nintendo

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Off-TV Play – Wikipédia, a enciclopédia livre

Nintendo Wii U Review (2012) - IGN

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Wii U - Codex Gamicus - Humanity's collective gaming knowledge at your fingertips.