I think it's like Mario Party 6 and 7 with the microphone. It's not really required, but if you want to play those games, you will have to get it. I think it was probably the luck of the draw when it was selecting the mini games that it didn't land on one with nunchuck. Look on the back of the box, does it have a number in the nunchuck or only on the Wiimote (4)?
22/07/2007
Mario and Sonic at the Olympic Games
Gold Coast, Queensland, Australia