Use 
to move.
Use 
or 
to jump.
Use 
or 
as a dash button.
Use 
or 
to duck.
Use 
or 
to pause.
Touch the spare item on the Touch Screen 
(if there is one) to use it. An item appears there if you grab it when you already have it (eg. grabbing a mushroom with a Super Leaf) or if you grab a Super Leaf when you have a Fire Flower (in this case, the Fire Flower becomes a spare item). If you grab an item when you already have two of it (eg. Getting a mushroom in Tanooki state with a spare Fire Flower or getting a Tanooki when you already have two) gives you ten coins instead.
Touch an arrow on the Touch Screen or use 
or 
to move the camera (unlike previous games, you can't go into first person and the camera will snap back when you let go of the button).
When 3D's turned on, use 
to go back to the default 3D view or 
to add more depth.