To play the game, begin by rolling the die to see who goes first (or go from youngest to oldest, or any order you want). Then begin rolling the die and moving around the board.
When you land on properties you can elect to by them or send them to auction. Once you own all of a property color you can begin building houses and hotels per the card's instructions.
If you land on a Community Chest or Chance card, draw the top card and do as it says.
If you land on someone else's property, you must pay them rent. Once you pass go be sure to collect your $200 dollars.
If you roll doubles: Move as the die require, handle any business for that section of the board, and roll again. If you roll doubles three times in a row, go to jail.
You can win by becoming a monopoly. Your bank account is your score and the goal is for you to collect everyone else's money and be the last player standing.
Buy early while you can, don't let all the properties be eaten up by your opponents!
Free parking is just a safe spot to land on, you do not get any advantage in the game for landing there.
When you go to jail, do not pass go and do not collect the $200 you otherwise would have.
Building: You can build once you own all the properties of one color and you must pay the price according to the title deed cards.
Building Shortages: If you want to build and there are no houses or hotels available then you must wait for another player to return or upgrade their property. If two or more players want to build at the same time in a shortage the house will be sold to the highest bidder.
Selling property: You can sell any property via a private transaction between any players. If the property has been built on then all houses and hotels must first be sold back to the bank prior to sale.
Mortages: Any unimproved property can be mortgaged, or houses/hotels must be sold prior to mortgage. In order to lift the mortgage and resume collecting rent you must pay the bank the mortgaged amount plus 10% (i.e. $100 plus %10 = $110). You can sell mortgaged property for any price, but the mortgage can only be lifted by the property owner.
Bankruptcy: You are bankrupt when you owe more money than you can pay. You lose.
Most importantly: Any of these rules can be changed at any time according to your gameplay, be as forgiving or as ruthless as you please.