Dirt mounds enter the battlefield

A new map tile is available: dirt mounds.

Dirt mounds act like temporary cover. Tanks cannot drive through them, bullets cannot pass through them, and they block line of sight while they are standing. Unlike stone walls, a dirt mound is destructible: when a tank bullet hits it, the bullet disappears and the mound turns into open ground.

This gives maps a softer kind of obstacle. A lane can start closed, then open up mid-fight after a shot. Tanks can use dirt mounds for early cover, clear paths on purpose, or fire through a barrier to change the shape of the arena.

Random maps can now include dirt mounds too, so generated arenas should feel a little less static without changing the core rules.