The card game they play is Rook! Which is some wimpy Christian card game made by Puritans and Mennonites because they were afraid of a regular deck of cards. Seriously. That's a real fact. Can you believe how stupid that is? Afraid of CARDS?! Cowards!
Official rules
The official rules for Tournament Rook (also known as Kentucky Discard) are as follows.
Four players are organized into two teams of two players each, sitting opposite each other. Players must keep their hands secret from all other players, including their teammates. The object of the game is to be the first team to reach 300 points by capturing cards with a point value in tricks. If both teams have over 300 points at the end of a round, the team with the higher point total wins.
Only certain cards have a point value. These are known as counters. Each 5 is worth 5 points, each 10 and 14 is worth 10 points, and the Rook Bird card is worth 20 points.
The deal
The 1s, 2s, 3s, and 4s are removed from the deck, and the Rook Bird card is added, for a total of 41 cards. The dealer shuffles and cuts the deck, then deals all of the cards, one at a time. After every player has received his or her first card, the dealer places one card face-down in the center of the table. This is repeated until there are five cards (the nest) in the middle of the table. The remaining cards are dealt normally.
Bidding
After the deal, players bid in increments of 5 points for the privilege of naming the trump suit. Bidding starts with the player to the left of the dealer and passes clockwise. The minimum bid is 70 points, and the maximum is 120 points (the number of points a team would make if they captured all the counters in the game). If a player chooses not to increase the bid, he or she may pass to the next player. A player that has passed may not make another bid for the round. The high bidder adds the five cards of the nest to his or her hand, then lays any five cards to the side. The high bidder then names the trump suit. At any time during the bidding process, a player can call a redeal if they have no points in their hand.
Play
After the trump suit has been named, the player to the left of the dealer places any card of any suit face-up on the center of the table. Play proceeds clockwise, with each player playing one card face-up in turn. After each player has played, the player that played the highest card of the suit of the leading card takes all of the cards played, or "takes the trick".
A player must either follow suit (play a card of the leading suit) or play the Rook Bird card. If a player has no cards of the leading suit, he or she may play any other card, including the Rook Bird card or a card of the trump suit. The highest card of the leading suit takes the trick, unless a trump card is played, in which case the highest trump card takes the trick.
If a player reneges, or fails to follow suit when he or she could have, the error may be corrected before the next trick is taken. If it is not discovered until later, the round ends, and the team that made the error loses a number of points equal to the bid, regardless of which team made the bid. The opponents score all the counters they captured before the error was discovered.
The person who takes the trick leads in the next trick. When a trick is taken, it is placed face-down in front of the player who took it. Tricks taken may not be reviewed by any player until the end of the round. The player that takes the last trick in a round captures the nest and scores any counters in it.
The Rook Bird card
The Roo