Can You Play Wii U Games on the GamePad Screen? Yes—Off-TV Play Core Feature

Yes—off-TV play is a core Wii U feature.

• GamePad screen: Full game display on the 6.2″ 480p panel.
• TV + GamePad: TV as main, GamePad as map/inventory/second view.
• Other devices (phone, PC, tablet): Not supported—no official streaming.

The GamePad is a dedicated second screen, not a standalone portable.