Here's what Super Mario 3D World prompts you with when you need to use the GamePad. This only pops up if you're not playing with the GamePad as a default controller.

Since a few people asked, here's what happens when you play a GamePad-required level with a Wii Remote and Nunchuck. pic.twitter.com/IWfhntrVE5

— Jose Otero (@jose_otero) November 20, 2013