This is nation-wide drinking game. Start with number 1 and move to other people. However, you clap your hand on the numbers 3, 6, 9.

If you fail to keep the simple rule, the you are a loser. Loser are obviously to drink penalty alcohol.

At the number of 30's, you should clap your hands twice at the number of 33, 36, and 39 because these numbers have two numbers in them. So 30's is the swamp of death. The groups of 60's and 90's are also the swamp of death, but the majority of the game finishes before it reaches the number of 60's and 90's.