At some point or another, most of us have either heard about 3 Patti Rules in some gathering or seen someone playing cards at a party, a casino, a group, or on Diwali and been curious about the game. There are specific guidelines for playing card game 3, Patti. Currently, they are engaged in 3 Patti, the most popular card game in India. It's also called a flash or a flush in some parts of India.