Deckipedia

304 (pronounced three-nought-four) is a trick based card game popular in Sri Lanka and Tamil Nadu and Maharashtra in the Indian sub continent. The game is played by two teams of two using a subset (7 through Ace of all suits) of the 52 standard Playing cards.

The cards are dealt by the dealer to all four players in a clockwise manner each getting four cards in the first round. Then the player to the left of the dealer looks at his cards and picks out a trump and places it face down on the table. He then shouts out a score for his team to score, based on the points he expects from the tricks his team wins, using the point system that follows. Then a member of the opposing team can pick their own trump, and must pick a score higher than that was named before for his team to score, if he wants his team to control the trump. This continues until a score is agreed. Then the rest of the cards are distributed and the game is started.

The game is played in eight rounds similar to the standard rules that follow, where the players answer the suit initially played, and tricks are won by the highest point value card played in the hand. But if a player doesn’t have the particular suit, then they can try to guess the trump and pass a face down trump to the player who has closed a trump card. If he guesses it right then he gets the hand or else the hand goes on.

Points are scored according to the points shown in the table. After all the hands are completed, if the team has scored the required score they win.

Card Values
Card Points
J 30
9 20
A 11
10 10
K 3
Q 2
8 0
7 0

Card values add up to 304 = 76 per suit * 4 suits.

Often, betting is done by dividing these values by 10, resulting in the point system:

J=3 9=2 A=1.1 10=1 K=0.3 Q=0.2 8=0 7=0

304[]

Rules of the game - http://www.sujee.net/projects/card304/docs/304rules.txt