Nintendo: two Wii U Gamepads will work on one system (update 2: but at a cost - and now with video) | Engadget
Wii U Console: Frequently Asked Questions
Nintendo: two Wii U Gamepads will work on one system (update 2: but at a cost - and now with video) | Engadget
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Wii U titles with dual GamePad support won't be available at launch, says Nintendo - The Verge
Super Smash Bros. for Nintendo 3DS and Wii U - Controllers
You're not getting dual-GamePad gaming on Wii U anytime soon | VG247
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Wii U will support TWO GamePads - Infendo: Nintendo News, Review, Blog, and Podcast
Super Smash Bros. for Nintendo 3DS and Wii U - Controllers
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No support for two GamePads at Wii U launch | Leviathyn.com
Nintendo's Wii U Will Support Two GamePads
Wii U Gamepads On Sale In Japan – Japandaman
Wii U Retrospective: Rayman Legends | Shacknews
Miyamoto on the potential for dual GamePad Wii U games
Editorial: An Ode To The Wii U GamePad, Nintendo's Mad But Brilliant Controller - Nintendo Life
CJ and Holmes disagree: Should the Wii U GamePad be ported to Switch? – Destructoid
You Can Now Buy A Replacement Wii U GamePad On Its Own - Nintendo Life
Aonuma elaborates on the ideas Zelda Wii U will include from Wind Waker HD, benefits of developing multiple games at once - Nintendo Everything
Wii U GamePad - Wikiwand
Wii U GamePad - Wii U Wiki Guide - IGN
Can Wii U Use Two Gamepads? - Games Gadgets
Wii U Supporting Two GamePads is Possible, but Not Likely says Miyamoto | TechnoBuffalo
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Nintendo Selling the Wii U GamePad Individually in Japan - Nintendojo Nintendojo