The game itself is so easy, even a rhythm-less white guy can pick it up within seconds. You and up to three of your friends can play as either Michael himself or as one of his backup dancers (or as I came to think of them, his Titos). You strap on the Wii-mote to your right hand and then follow whatever the bejeweled white glove of your character is doing on screen. Michael grabs his crotch, you grab your crotch. Michael does that claw-hand Thriller move, you do that claw-hand Thriller move. There are 26 of Michael's hits, ranging from his ebony Off the Wall period, to his later ecru Invincible era.
Now technically you don't actually have to dance-dance; just like all Wii sports game, all that matters is the motion and position of the Wii-mote itself. You could do aces at the game just by standing in one spot and wiggling the remote in rhythm, as one joyless friend of mine did. But it's almost impossible to hear MJ's music and not want to kick up your feet and dance just like him. Just make sure you move the furniture out of the way and be prepared to sweat, because man, that guy moves a lot!