Next we need TWACT - Trench Wars Are Creepers Too.
The trench dirt gets hurt by weapons and then it dies and disappears, but new dirt is slowly, constantly emerging from the sides of the field towards the middle. And you get points when the dirt gets hirt. Hurt. Dirt spawn bricks would be specialized and placed at regular intervals on the sides of the field. You could kill them with Trench Shovel, but only weapons would get you your points.