Wii U GamePad
From SmashWiki, the Super Smash Bros. wiki
The Wii U GamePad is a controller for use with the Wii U console. In addition to standard controller capabilities, the GamePad includes a 6-inch touchscreen in the center, which can be used in Stage Builder, and in conjunction with or in place of the TV for displaying the game, as well.
The Wii U GamePad is one of the many controllers that can be used to play Super Smash Bros. for Wii U. The GamePad's near field communication functionality is also required in order to use amiibo figurines with the game.
Standard Controls (Super Smash Bros. for Wii U)