I have already got an idea.
It's called "Paradise" and there's two ways of looking at it that I see.
First one goes;
I would set it up like an old video-game, it'd be top-down. Everyone starts out was a "TOURIST".
Once you have explored all of the map or gone to places that are not touristy (ranks will come soon), you become a CITIZEN.
When you commit a crime, you become a CRIMINAL.
When you try to attack someone who commits a crime, you become a POLICEMAN.
If and when you never become a "CITIZEN" rank, you will stay as a Tourist, and you are more vulnerable.
The map will not be open to you as a tourist, but 5 people have to stay at one "area unlocker" and then the rest of the area will be unlocked for exploration.
When everyone except two people are dead, the island is CONDEMNED and when the two people get in the same two areas, they become the only accessible areas.
No way to run.
Number two goes like this;
It's like Idea #1 but a little more added, less simple. You would have to factor in things like SHAME, UNDERGROUND-NESS, EXPLORATION. Shame would limit you from doing certain things - catering to your needs like HUNGER, EXCRETION, SLEEP. When your SHAME level is high, you can't do those things. When it is low, you can do those things, but you will fall into a different rank (either SHAMELESS or) Homeless. As Homeless, you can only get money from other people, either have them give it to you or you commit crimes and become a criminal. When UNDERGROUND level is high, you know the best places to hide and can hide in better places, and you know places to go to to fill needs and become more of a "CITIZEN" rank than a TOURIST. This rank only exists for tourists and it is the way you get to CITIZEN. the rank unlocks after you get UNDERGROUND level past 20, you start at 0. Then the EXPLORATION rank lets you unlock all places by going to different UNDERGROUND places. You need UNDERGROUND and EXPLORATION ranks to be even.
idk. i thought of this while i was falling asleep.