Nintendo clarifies that Wii U GameCube Adapter ONLY Compatible With Super Smash Bros, not "all games that use Wii U Pro Controller/Wii Classic Controller" : r/Games
Wii U - Super Mario Wiki, the Mario encyclopedia
The Wii U revisited: Looking back on a forward-thinking console | Engadget
You Could Brick The Nintendo Wii U Just For Not Using It, Reports Claim : r/nintendo
The hardware of Super Smash Bros. for Wii U (hands-on) | Engadget
Wii U GamePad: 5 ways we'd fix the Nintendo controller
Report: 3DS Can Be Used As a Wii U Controller in Super Smash Bros. - IGN
Wii U | Nintendo
After 10 Years I'm Finally Getting A Wii U, But Where Should I Start? | Nintendo Life
In praise of the Wii U, my son's first console | Eurogamer.net
The Wii U Is Nintendo's Slowest Selling Console Ever
Nintendo Wii U Pro Controller Review | PCMag
Gaming For Couples: The best Wii U bundle, games, demos and accessories
Wii U Super Smash Bros. - World Edition, USA NTSC version game with World Edition packaging as pictured. No Region Restrictions. By Brand for Nintendo - Walmart.com
GameCube Controller Adapter only works with Super Smash Bros. Wii U | VG247