The property game of Monopoly is the best-selling board game. It was introduced in 1935 and more than 80000000 sets had been sold by the end of 1974. Charles Darrow, an unemployed inventor, created the game.
The record for the longest game played by four players was set in 1974; the game lasted 264 hours - from December 26 1974 to January 5 1975. - bigsiteofamazingfacts.com; boardgamegeek.com; boardgames.about.com