It depends on which controller you are referring to. The Wii U gamepad will not work on the Nintendo Wii but the Nintendo Wii motion plus controller will work on the Nintendo Wii.
Xbox games will not work on a Wii, and Wii games will not work on a Xbox. however, if you mod soft your wii, you can play games from old platforms.
No Wii U games will work on the Wii.
Yes, Wii games will work on a Wii U. You can also transfer any save data and downloaded content form the Wii to the Wii U.
the wii kind
no
Nope, only wii games work for wii and vice versa.
Only Wii discs and Nintendo GameCube discs will work on the Wii
GameCube games and games on VirtualConsole. You can modify Wii to play PSX games also and other on emulators.
No, the original Wii cannot play Wii U games
Yes just put your gamecube game in the wii and you can play the game you will need the game cube pad
No
No they will not but if you have it chiped they will