Buy it. Build it. Bankrupt your friends.
Rentopia is a free property trading board game you play in the browser. There is no signup. One player opens a private room and shares the link, and friends join from that link or a short code. A room holds 2 to 8 players.
The rules are written down. Start with how to play, open the board sheet for every rent, or the card list for Fortune and Town Fund. Guides says which page to read, and updates is the change log.