As of late March 2023, it will no longer be possible to make purchases in Nintendo eShop for Wii U and Nintendo 3DS family systems, including add-on content.
For more details, please see here.

Super Smash Bros. (Title Pending) for Nintendo Switch
Nintendo Direct
Add-on Content Smashes In!
update Bayonetta
update Corrin

Warning! Spoilers Inside!
The following webpage has details on hidden parts of the game. Do you wish to continue?

GameCube Controller Adapter for Wii U

Launch: 29/11/2014

This is a peripheral which will allow you to use Nintendo GameCube controllers with Super Smash Bros. for Wii U. (Wii U console, software and Nintendo GameCube controllers sold separately.)

You can connect up to four Nintendo GameCube controllers using the GameCube Controller Adapter for Wii U. The peripheral plugs into the Wii U console with two USB cables – you can use either the USB ports in the front or rear of the console.

You can use your existing Nintendo GameCube controllers to enjoy Super Smash Bros. for Wii U with the same feeling of control as Super Smash Bros. Melee and Super Smash Bros. Brawl.

The Nintendo GameCube Controller – Super Smash Bros. Edition shown is also planned for release on the same day.