Hasbro states that the longest game of Monopoly ever played lasted:
Hasbro conducts a worldwide Monopoly tournament. The first Monopoly World Championships took place in Grossinger's Resort in New York, in November 1973, but they did not include competitors from outside the United States until 1975. It has been aired in the United States by ESPN. In 2009, forty-one players competed for the title of Monopoly World Champion and a cash prize of $20,580 (USD)—the total amount of Monopoly money in the current Monopoly set used in the tournamen
Parker Brothers and its licensees have also sold several spin-offs of Monopoly. These are not add-ons, as they do not function as an addition to the Monopoly game, but are simply additional games with the flavor of Monopoly:
Advance to Boardwalk board game (1985): Focusing mainly on building the most hotels along the Boardwalk.
Don't Go to Jail: Dice game originally released by Parker Brothers; roll combinations of dice to create color groups for points before rolling the words "GO" "TO" and "JAIL" (which forfeits all earned points for the turn).
Monopoly Express: A deluxe, travel edition re-release of Don't Go To Jail, replacing the word dice with "Officer Jones" dice and adding an eleventh die, Houses & Hotels, and a self-contained game container/dice roller & keeper.
Express Monopoly card game (1994 U.S., 1995 U.K.): Released by Hasbro/Parker Brothers and Waddingtons in the U.K., now out of print. Basically a rummy-style card game based on scoring points by completing color group sections of the game-board
Free Parking card game (1988) A more complex card game released by Parker Brothers, with several similarities to the card game Mille Bornes. Uses cards to either add time to parking meters, or spend the time doing activities to earn points. Includes a deck of Second Chance cards that further alter game-play. Two editions were made; minor differences in card art and Second Chance cards in each edition.
Monopoly City: Game-play retains similar flavor but has been made significantly more complex in this version. The traditional properties are replaced by "districts" mapped to the previously underutilized real estate in the centre of the board.
Monopoly Deal: The most recent card game version of Monopoly. Players attempt to complete three property groups by playing property, cash & event cards.
Monopoly Junior board game (first published 1990, multiple variations since): A simplified version of the original game for young children.
Monopoly Town by Parker Brothers / Hasbro (2008) a young children's game of racing designed to help them learn to count.
The Mad Magazine Game (1979): Gameplay is similar, but the goals and directions often opposite to those of Monopoly; the object is for players to lose all of their money.