Thanks for checking it out! You've got the basic idea right, though. At the start of the duel, one twin plays birdie, then the other plays Doubles, giving the twin a copy. I haven't had a player destroy the Birdie yet, but if they did, the other twin can play it as a back-up. But even without the Birdie, they do still have some fun tricks up their sleeves. I appreciate the kind words!