Platform: Wii U

If you enter the Wii U's menu on your birthday, special music will play and all of the Miis will clap for you.

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.

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.

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.

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.

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.

In 2021, dataminers discovered a consistent security vulnerability, later termed "ENLBufferPwn", in multiple Nintendo 3DS, Wii U, and Nintendo Switch games. ENLBufferPwn made it possible to inject code into another player's system during online multiplayer by deliberately triggering a buffer overflow in a game's "ENL" network library. The glitch was known to be possible in Animal Crossing: New Horizons, Arms, Mario Kart 7 (where the glitch instead targets the "Net" library), Mario Kart 8, Mario Kart 8 Deluxe, Nintendo Switch Sports, Splatoon, Splatoon 2, Splatoon 3, and Super Mario Maker 2, with other games potentially being affected.

ENLBufferPwn generated significant cybersecurity concerns due to its ease of execution, the fact that it could be pulled off without the target player's notice, and the wide range of actions that could occur through it, up to and including identity theft and espionage. Reflecting this, the United States federal government's National Vulnerability Database gave the glitch a 9.8 rating, reflecting critical threats to public safety. Following multiple reports issued by white hat hackers between 2021 and 2022, Nintendo patched all known affected games to remove the vulnerabilities that made ENLBufferPwn possible.