some logic about the game, you leave a nuclear shelter (see for yourself, when you begin to drive) to escape the city. 19 missiles have been detonated and you survived those in your shelter... let's try to escape while a missile is chasing us :D
you could also try to program the steam that it forms clouds and can move, and that it can rain down at a random place and if it hits the soil or sand, and turns into a river and moves some sand/soil as sediment.
 "Fixation"){kind=icon}
 "Nuclear Outrun"){kind=icon}
 "Battalion: Nemesis"){kind=icon}
 "WarLight"){kind=icon}
 "ClueSweeper"){kind=icon}
 "Tentacle Wars"){kind=icon}
 "The Last Stand: Union City"){kind=icon}
 "When The Plague Came"){kind=icon}
 "The Sandbox"){kind=icon}