The term 'Master of the Game' is a job title that refers to someone who is in charge of overseeing a particular game or activity. The crossword solution for this term is 'WARDEN, ' which is a person who is responsible for maintaining order and enforcing rules in a particular area or institution. This could include prisons, schools, parks, or other places where people gather. A WARDEN is expected to be knowledgeable about the rules and regulations of the place they are overseeing, and to ensure that everyone follows them.