The goal of Bridge is to have the most points at the end of the match (called a “rubber”). The rubber ends when a team wins 2 games. A team can win a game by earning a contract score of 100 or more points.

Bridge is played with four players grouped into two teams. Your team is "North-South" (blue) and the computer's team is "East-West" (red).
 

Bidding

Each player can either bid or pass when it’s their turn. 

Click on a suit or "NT" (No Trump) in the row you choose to submit a bid. The row number shows how many more than 6 tricks you think your team can win. A “trick” is a round where each player plays one card. For example, if you bid 1 Heart, that means you are committing or promising to win 7 tricks (6+1) with Hearts as the trump suit. If you bid 3 Spades, that means you are committing to win 9 tricks (6+3). The higher the bid, the more difficult it is to fulfill the contract.

Each player can "Double" their opponents' most recent bid. The opposing team can then "Redouble" the bid. Under Double or Redouble, that game rewards double or quadruple points respectively.

Bidding ends when three players in a row choose "Pass". The team that makes the final bid must win at least that number of tricks plus 6. The final highest bid is known as the "Contract". The player who first bid the trump suit (or No Trump) for their team becomes the “Declarer”.

Playing Stage

Each player is dealt 13 cards. Each player will then take turns placing one card. 

The first player to place a card will be to the left of the Declarer (the player who won the bidding stage). The card the Declarer places will determine the “lead suit”.

After this, the other players must place cards that have the same suit. If you don't have a card in the lead suit, you can place any card, but only a card in the lead suit or a card in the trump suit can win the trick. Any card from the trump suit will outrank any card from the lead suit. However, in a No Trump contract, you must play a card from the lead card's suit. 

The player who places the highest card wins the trick and takes all the cards. The player who wins the trick will place the first card in the next trick. This process is repeated until all players have no cards left.

Scoring

The declarer’s team gains contract points if they fulfill the contract. Overtrick points are assigned for each trick that was taken above the contract’s stated number. Undertrick points are awarded to the declarer’s opposing team if the declarer’s team does not fulfill the contract. Contract, Over, and Under points are further increased for a doubled or redoubled contract.
 

The base contract scoring is below:
 

• If the trump suit is clubs or diamonds: 20 points per trick
• If the trump suit is hearts or spades: 30 points per trick
• If NoTrump (NT): 40 points for the first trick and 30 for each subsequent trick
   

Extra points are awarded for winning a small slam (12 tricks) or a grand slam (13 tricks). Honors points are awarded for starting the deal with the top four or five cards (A, K, Q, J, 10) in the trump suit, which is determined during bidding. After a team scores 100 or more contract points, the game is complete and the next game starts. A rubber (a single match of Bridge) continues for as many deals as needed until one team wins two games.