Starting with number 1, one person can say the numbers up to three and last person who speaks 31 becomes a loser.

For instance, when the first person says 1,2,3, then next person has 3 choices to continue like 4 or 4,5 or 4,5,6. The game goes like this and the one who calls 31 is the loser. It is very simple game but necessary to use brain to calculate the number in order to avoid the penalty drink.

+ Upgrade version is to extend the number up to 51 so that people who say 31 and 51 drink together.