So I've had this idea for a while where the object of the game is to sneak a nuclear warhead into your enemy's territory (either one- a capital city, or several hit points- population centres).
Each player is the leader of a Super power, and the catch is you don't have enough resources to advance, so you are relying on trade with other people (for example, one area is rich in uranium, but has no money to fund anything, so they rely on selling uranium to other powers). You can also agree to apply sanctions on players to try and slow their progress, but the people you enter an alliance with may just have a nuke of their own heading your way!
There are a variety of ways to transport nuclear weapons, the easiest one being nuclear submarines, because enemy forces can't see them. In this respect, that part of the game is a little bit like battleship, where except for bombing random sea zones you ping them, and you can also blockade area(s) with battleships, etc. And because the subs are always moving, the player can only mark last known positions and are never too sure of where an enemy sub is exactly, or if it's carrying a nuke or not.
You can also have nukes on battleships (and maybe planes if gameplay allows it). If your tech reaches a certain level, you can build long range missile launchers, and don't even need to sneak the nuke into enemy territory.
I'm not sure how serious to make this (a deep strategy in a Cold War setting or a tongue-in-cheek sort of approach).
It's just a really rough idea, and any input would be great.
Cheers