French have a popular game called Belote which is played using a French deck. Skat is a German game which uses German decks. Many countries have some popular games and each group has its own set of rules to play the game. Card games are played by a set of rules which may not be totally accepted by all, but in the particular group, café or club, it may be accepted. But if the game becomes very popular then those set of rules are widely accepted. Some card games have official governing bodies like Germany’s Skat; French tarot and Poker games. The U.S. Playing Card company has come out with rule books for many card games which have a standard set of rules. The International Skat Players association has set the rule for Skat. World bridge federation is the governing body and tournaments of bridge are administered by them. But games like Pinochle and canasta have no regulating bodies and even though they are very popular, there are no set rules which is accepted around the world. In tournaments and competitions, as in Poker, rules must be strictly followed but in an informal setting these rules can be changed and modified according to the will. Players are free to change the rules, even the standard set of rules. They can even add or invent some rules.