The z button is on the nunchuk controller it usually doesn't come into a lot of use it usually just helps you look around in certain games or execute moves that you could of done a different way or sometimes Z helps execute moves you cannot use.
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There is not a z button on the wii remote but there is one on the external controller nunchuk right at the front of it next to the C button
On the regular wii no but on the new wii u yes
The shield button is the Z button on the Nunchuck controller. The Z button is below the C button.
The action button is a button on your controller that accesses buttons, controls, basically, ANYTHING that the game will let you do. On PlayStation, the action button is The square button. On Xbox, it is the x button. On wii it is the A button, ds, wii, and PC, I am not sure.
open the bak of the controller (where the batteries go) and find the little red button. go to the wii & open the little cover at the front (where a sd card goes and find red button hold them both down simultaneously and wa-lah!! ;D