One thing that we haven’t fully figured out in Polypoly yet is how owning multiple properties in a color group (or even between color groups) could have special rules and win conditions. For example, if a player owns Means of Accounting, they can choose to accept rent in a currency of their choosing. Perhaps, if they also own Banks, then it unlocks some special benefit.
Having sets of special rules around the properties could really deepen the game on a lot of levels.
Would love to hear some ideas - we’re starting a list of them, and will look at rolling them out into the official rules when they’re ready.