@Holir_ @Heliograph Basically two or more players agree not to charge the others when they land on a property, pool cash, what ever you like basically.

The rules don't forbid things explicitly its more like "if you are going to do xyz then you have to do it like this". You can literally make up rules to allow you to cooperate.

My brother says he is a "capitalist". He really hated it when myself and a friend played him at monopoly. He thought he knew how to play the game. It ended with him frantically reading the rules then storming off in a massive sulk. It was a fun Xmas