You play some version of Risk. Something with defined countries/areas and you’re trying to conquer and claim more and more, defeating enemies and obstacles.
But … you can pinch every single army/country, to make the army bigger/smaller on demand. Like the pinch gesture on touch screens!
Of course, this has an element of balance/cost. Bigger armies are stronger but also require much more resources/food/space. So you’ll have to strategically make stuff larger or smaller, also from the enemy, to fit the requirements of every individual battle.