# Battlefield

The main battles in Zombie TD take place across **ruined cities**, with roads winding through the devastation. 

🧟 Zombies attack in **waves**, advancing toward the city protected by a concrete wall - the *last line of defense* for survivors.

🎯 The player's task is to strategically place **Turrets** along the roads to stop the undead from breaching the city.

🏰 At the heart of the defense stands the **Defense Gate** - the final barrier protecting the remaining population.

* If zombies reach the end of the Battlefield, they will **attack the Defense Gate**
* The Gate has its own **HP**, which can be increased by:
  * Leveling up your **Commander**
  * Unlocking **sector bonuses** on the Campaign map
* Zombies will continue attacking the Gate until it's destroyed - *unless eliminated by nearby Turrets first*

### 🔩 Turrets & Iron - Core Battle Mechanics

* Each battle begins with a **limited amount of Iron** - a resource used exclusively for building and upgrading Turrets during combat
* Additional Iron is earned by **killing zombies** - the stronger the enemy, the more Iron rewarded
* Players can only use Turrets for which the corresponding **NFT is equipped** in a slot on the official site: zombietd.app
* Any deployed Turret can be **upgraded to Level 6** by spending Iron

### 💣 Arsenal

To stop the horde - especially near the Defense Gate - players can deploy special **Arsenal items**:

* **Grenade**
* **Dynamite**
* **Cryogenic Bomb**
* **Hydrogen Bomb**
* **Nuclear Bomb**

🛒 Additional Arsenal items can be purchased from the **in-game store** using **ZTD tokens**


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