subdirectory_arrow_right Angry Video Game Nerd Adventures (Game)
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When Angry Video Game Nerd Adventures launched on Wii U, the Miiverse page initially allowed screenshots from the game to be posted, which led to many users using the game as a loophole to post profanity. Shortly after, the ability to post screenshots would be removed.
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Attachment When game data is transferred from the Wii to the Wii U, an animation will be shown of the icons of the transferred games being carried by Pikmin, creatures from the Pikmin series by Nintendo.
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Attachment The Wii U Gamepad Prototype was just two Wii Remotes and Nunchuck analogue sticks attached to the sides of an LCD screen.

They also created a prototype for the Wii U Zapper which consisted of an LCD screen attached to a Wii Zapper.
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In a previous Iwata Asks Interview from 2011, Satoru Iwata stated that the Wii U hardware started development back in 2008. This means it started development 2 years after the original Wii was released, 3 years before it's debut at E3 2011, and 4 years before it's release.
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The Wii U Mii Maker's music contains the music used for the Great Fairy Fountain in the Zelda series, and Super Mario Bros 3's Water Land.
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If you enter the Wii U's menu on your birthday, special music will play and all of the Miis will clap for you.