This game is much better with a friend.
When you play your CDs, we can agree on music, then dance cooperatively. That means your score depends on BOTH players. Now that makes it fun to egg my friends on...
However, it is hard to keep a combo going, as the timing is a little more strict. However, to make the game a bit more difficult, the themes change. So when you or your partner hits enough notes, the background gets in the way of the notes just enough to make it hard for normal players.
The tournament mode is new, and it also increases teamwork...YES!!!!
Might not be worth the forty bucks you paid for it though...