This item has been discontinued and replaced by the 5in1 X-Adapter.

The Nintendo Wii has GameCube controller ports on the top. The X-Arcade uses these ports to work on the Wii, and therefore only works with games that have GameCube controller support. This includes all GameCube games, Virtual Console downloadable games, and the list of Wii games here:
List of Wii games with GameCube Controller support.