Could have a mario party style of game. eg. someone(s) makes a main board dice mode then members can contribute with mini games. This way, member can create the mini game however they want. They can be 2D or 3D and don’t required the same way to control player. Players only need to earn scores/power up..etc from these games.
Any number of players can join to the board because player could be just a sprite2/3D visual with values for positions/power/scores..etc
When joined a player could get assigned a password so they can “log in” and play whenever.
Player roll the dice and go to mini game either randomly or preset.
Scores and special items/attributes from minigames can be updated to the player in the main board through some variables.
It doesn’t have to be multiplayer. The goal is for each player to update their scores and advance their position anytime they play, and perhaps power to slow down others’ advancement. Eg. I play one session and earn 100pt. and the next day I log in to find someone used a powerup to decrease my point to 70 , sent me back a few position, or whatever.