part to sync a classic controller to wii remote?and tetris question

[kimja]

What is the name of the part to sync a classic controller to wii remote?

i have 1 wii remote controller and 2 clasic controllers.
but can not play 2 player on tetris party i think.

becous i ned something to sync between clasic controller and original wii remote controller.
and do i have to have 2 wii remote to sync bothe classic controllers?