When you reach Level 30, you can choose a second upgrade depending on the basic upgrade that you chose. If you choose Gunner , your cannon is replaced by four tiny cannons which shoot small, weak bullets but has drastically increased Reload.

If you choose Hunter , a second cannon will overlap the first one and shoot an extra bullet every shot. These Drones could be destroyed albeit having high health. It is possible to destroy an Arena Closer, however, it has such a large amount of health that attempting to destroy it is not worth it.

The tank editor requires JavaScript to work. Use the little triangles to corner the weak tanks and ram into them.