The Wii U has sold through 13.5 million units, making it officially Nintendo's worst-selling console | VG247
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Wii U Sales
Compared to Wii U · Xbox One, this graphic shows the pace of sales of PS 4 that exceeded 30 million units sold at the fastest speed in PS history - GIGAZINE
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Dismal Wii U sales prompt pay cuts for Nintendo execs
Wii U sales rise 200 percent after price cut - GameSpot
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Chart: Nintendo Reports Disastrous Wii U Sales | Statista
Nintendo Finally Sells 10 Million Wii U Consoles - Video Game Coverage - Video Games, Pokémon GO