"Monopoly one" refers to a popular board game called "Monopoly." It is a classic game of economic strategy and property trading where players roll dice to move around the board, buying and trading properties, and trying to become the wealthiest player. The game involves elements of luck, strategy, and negotiation, making it a favorite for many players. "Monopoly" has been adapted into various themed versions, such as "Monopoly: Disney Edition," "Monopoly: Game of Thrones Edition," and many others, adding a unique twist to the original game.