Priced at $14.99, both the Wiimote and Nunchuk can slot into them. So these are the official ones, but there will also be efforts from third parties - such as this pair from GAME:
Samba time is now less than a month away, the game comes out on September 19th.
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I worked with those some years ago, and they are basically identical to the home unit, but it needed special recordable ...
Wii's World is not officially affiliated with Nintendo! (but they wish we were).