Found it. Press and hold the Gamepad screen until an icon appears, then swipe down. Screen appears on Gamepad after a confirmation message. Do the same but up and it goes back onto the TV.
It's single player mode too yes, not sure how you do it though (not owning a Wii U)
Hope not. Said in the Wii U trailer you could play it on the Wii U Gamepad.
I thought it was only in multiplayer mode
Does anyone know how to get the game to play on the Gamepad on the Wii U. For the life of me I can't figure it out.
The multi-player gamepad use is so you can play 5 co-op at home