There is no physical or digital “Super Mario 64” game card or icon that runs natively on the Wii U menu without emulation. Instead, availability was as follows:
: Remap any button to your liking via the Virtual Console menu.
The original N64 controller had a unique layout: one analog stick, a D-Pad, six face buttons (A, B, four C-buttons), and a trigger. The Wii U has a very different layout. Here is the optimal mapping.