1 person goes through the deck and puts an Ace up to King on the floor side by side. On the floor it should be like: A 1 2 3 4 5 6 7 8 9 10 J Q K. They don't have to be in this order, but it's much easier.
That same person takes the deck and looks at the top card. Only he/she can see the card. The person sitting to the left of the dealer must guess what the card is. The person gets 2 guesses. When the person guesses, the dealer must either say if the card is higher or lower than the person's guess. The person then guesses again.
If the person guesses the card right on the first guess, the dealer has to take drinks from the beer equal to double the number on the card. Ex, if the card is a 7 and the person says 7, the dealer places the card onto the 7 on the ground and must take 14 drinks. If it's a 2, the dealer has to drink 4, if it's a K, the dealer has to drink 26 etc.
If the person guesses the card right on the second guess, meaning they got the first guess wrong, the dealer places the card on the field and must take drinks equal to the number on the card. Ex, if it's an 8, the dealer must take 8 drinks, if it's a Q, the dealer must drink 12 etc.
If the person doesn't guess the card on either guess, the dealer places the card on the field and the guesser must subtract his/her guess with the card's number and drink the balance. Ex, if the card is a 6, and the guesser says 4, they have to drink 2. If the card is a 3, and the guesser says 9, they have to drink 6 etc.
After a player has guessed, and somebody has drank, the dealer goes to the next person to the left and keeps on going until the dealer has stumped the amount of people (read below).
When a player doesn't guess the card, this is called a stump. The dealer must stump however many guessers there are. Ex, if there are 3 players, 1 dealer and 2 guessers, the dealer must stump either both of the guessers, or one guesser twice. If there are 5 players, 1 dealer and 4 guessers, the dealer must get 4 stumps etc. If a person guesses the card on either guess, and after the dealer has drank, it's the next person to the left's turn.
If the dealer stumps the required amount of people, the person to the left of the dealer becomes the new dealer and it goes around again until all the cards are on the floor. Then all the cards get picked up, shuffled, and the game gets played again.