Gaming law is the set of rules and regulations that apply to the gaming or gambling industry. Gaming law is not a branch of law in the traditional sense but rather is a collection of several areas of law that include criminal law , regulatory law , constitutional law , administrative law , company law , contract law , and in some jurisdictions, competition law . At common law, gambling requires consideration , chance and prize , legal terms that must be analyzed by gaming lawyers within the context of any gaming operation. 
The Chinese government operates two lotteries : the China Sports Lottery and the China Welfare Lottery. The Chinese government does not legally consider the lotteries a form of gambling.  Illegal gambling in China remains common, including unofficial lotteries, clandestine casinos, and betting in games such as mahjong and various card games . In 2010, The Daily Telegraph reported that an estimated one trillion yuan are wagered in illegal gambling every year in China. Problem gambling exists in the country, and may be more prevalent than in countries with legalized gambling.  Online gambling is another outlet for illegal gambling in the country.