It's a Muggle board game where you're given a starting amount of fake money and you go around a board with tokens and you can buy spaces on the board with fake money.
If people land on your spaces they have to pay you in fake money. You can also put little hotels or houses on your spaces which makes the amount of money people have to pay go up.
It's pretty easy once you get started and it's a good game for a larger group. Rounds can last a while.